My buddy comes through, here is the requirement that any MOTOR VEHICLE must be registered. Registering as we all know means you gotta put the plates they send you on the vehicle(I can find that part too if need be).
(625 ILCS 5/3‑402) (from Ch. 95 1/2, par. 3‑402)
Sec. 3‑402. Vehicles subject to registration; exceptions.
A. Exemptions and Policy. Every motor vehicle, trailer, semitrailer and pole trailer when driven or moved upon a highway shall be subject to the registration and certificate of title provisions of this Chapter except:
(1) Any such vehicle driven or moved upon a highway
in conformance with the provisions of this Chapter relating to manufacturers, transporters, dealers, lienholders or nonresidents or under a temporary registration permit issued by the Secretary of State;
(2) Any implement of husbandry whether of a type
otherwise subject to registration hereunder or not which is only incidentally operated or moved upon a highway, which shall include a not‑for‑hire movement for the purpose of delivering farm commodities to a place of first processing or sale, or to a place of storage;
(3) Any special mobile equipment as herein defined;
(4) Any vehicle which is propelled exclusively by
electric power obtained from overhead trolley wires though not operated upon rails;
(5) Any vehicle which is equipped and used
exclusively as a pumper, ladder truck, rescue vehicle, searchlight truck, or other fire apparatus, but not a vehicle of a type which would otherwise be subject to registration as a vehicle of the first division;
(6) Any vehicle which is owned and operated by the
federal government and externally displays evidence of federal ownership. It is the policy of the State of Illinois to promote and encourage the fullest use of its highways and to enhance the flow of commerce thus contributing to the economic, agricultural, industrial and social growth and development of this State, by authorizing the Secretary of State to negotiate and enter into reciprocal or proportional agreements or arrangements with other States, or to issue declarations setting forth reciprocal exemptions, benefits and privileges with respect to vehicles operated interstate which are properly registered in this and other States, assuring nevertheless proper registration of vehicles in Illinois as may be required by this Code;
(7) Any converter dolly or tow dolly which merely
serves as substitute wheels for another legally licensed vehicle. A title may be issued on a voluntary basis to a tow dolly upon receipt of the manufacturer's certificate of origin or the bill of sale;
(8) Any house trailer found to be an abandoned
mobile home under the Abandoned Mobile Home Act;
(9) Any vehicle that is not properly registered or
does not have registration plates issued to the owner or operator affixed thereto, or that does have registration plates issued to the owner or operator affixed thereto but the plates are not appropriate for the weight of the vehicle, provided that this exemption shall apply only while the vehicle is being transported or operated by a towing service and has a third tow plate affixed to it.
Yup you have to title a "custom/specially constructed" vehicle also.
(625 ILCS 5/3‑406) (from Ch. 95 1/2, par. 3‑406)
Sec. 3‑406. Application for specially constructed, reconstructed, custom, street rod, or foreign vehicles.
(a) In the event the vehicle to be registered is a specially constructed, reconstructed or foreign vehicle, such fact shall be stated in the application and with reference to every foreign vehicle which has been registered heretofore outside of this State the owner shall surrender to the Secretary of State all registration plates, registration cards or other evidence of such foreign registration as may be in his possession or under his control except as provided in subdivision (b) hereof.
(b) Where in the course of interstate operation of a vehicle registered in another State, it is desirable to retain registration of said vehicle in such other State, such applicant need not surrender but shall submit for inspection said evidences of such foreign registration and the Secretary of State upon a proper showing shall register said vehicle in this State but shall not issue a certificate of title for such vehicle.
In the event the applicant seeks to have the vehicle registered as a custom vehicle or street rod, that fact must be stated in the application. Prior to registration, custom vehicles or street rods must be inspected by the Secretary of State Department of Police. Upon successful completion of the inspection, the vehicle may be registered in the following manner. The make of the vehicle shall be listed as the make of the actual vehicle or the make it is designed to resemble (e.g., Ford or Chevrolet); the model of the vehicle shall be listed as custom vehicle or street rod; and the year of the vehicle shall be listed as the year the actual vehicle was manufactured or the year it is designed to resemble.
(Source: P.A. 96‑487, eff. 1‑1‑10.)
Any more questions? Again just trying to help here.