DIY Gas Standup Scooter from a 20" BMX Bike

I was in the garage brainstorming (seems like I do my best thinking in the garage...lol)
My 9 yr old daughter has outgrown her 20" BMX bike. Awhile ago, I bought her a new 24" MTB which was too big...but not anymore.
Since my kids & I have been having so much fun riding around our community on the Razor E325 that I converted to gas (there is a build thread), I started searching for another gas scooter both new & used. I found a nice EVO Powerboard on CL but the seller was too flaky & wouldn't answer texts or emails so I gave up on that one.
For less money, I could just build one myself with stuff I got laying around.
I got a few ideas online looking at both kickbikes & adult push scooters.
The 1st few pics are of a Sherpa Evo. A DH standup scooter & the inspiration for this new project.
I'm thinking of either using the 12" wheels I already got, but the rims are steel & the bearings are junk (although I have repacked them with grease). I also retrued them & added a nice new Kenda tire.
I might get some 10" Goped wheels but I'm trying to build this without buying hardly anything.
The seat/seatpost & crankarms/pedals will be removed & I'll probably end up doing a rear friction drive since I already have 2 driver units & 1.25" rollers. I'll just need to fab a floorboard to stand on out of aluminum or wood (or an aluminum/wood combo) & use the bottom bracket area as one of the mounting points for strength.
To get my arms/hands higher up & in the correct position, I'll need to buy a BMX stem & BMX upright handlebars with the cross brace.
See the pics & tell me what you all think.
-Lowracer-

Here are a few more pics of the mockup bike next to the current Razor gas scooter.
Wheelbase is almost the same with just a bit more on the new project.
Keep in mind, the seat & post will be removed, and high rise BMX handlebars will replace the MTB flat bar.
-Lowracer-

This is something I found at Walmart for $70, but again I'm not trying to spend any loot...
-Lowracer-

dgizzle,
Kent makes an affordable combo scooterbike.
Diggler has a few that they also market towards dogsled type use.
I think I'm sold on the 'standing room only' for portability.
I've been folding down the handlebars on the Razor & throwing it in the trunk of my car for those days 'just in case'.
-Low-

Yeah, I've seen the Toucan's. I'm not so sure buying a new one is the best money spent?
Take a look at what $395 gets and you're done.
http://www.ebay.com/itm/16063403742...X:IT&_trksid=p3984.m1436.l2649#ht_4173wt_1091
-Lowracer-

I was half tempted by the Goped GTR46i but for $1100, I'll pass. Also its louder than my old pocketbike engines, but one sick puppy of a ride...
-Lowracer-

16v,
Yeah, that was the plan.
Its so easy to take the easy route & just buy one already built.
I dont have any more spare engines just laying around (except the three pocket bike Cag stage 2's) that I swore never to unbox & mount ever again...lol
If I get a good deal on an engine or borrow an engine from 1 of my 2 MB's (Tanaka 40 & Tanaka 47r) I'll be good to go...
-Low-

dgizzle,
I found an Izip in my local CL listing for $30 (not working).
This could be an easy scooter to motorize.
16v,
How would you connect the floorboard?
I'm thinking of using the bottom bracket as a threaded mounting point. Maybe run some angle aluminum past the bottom bracket and back to the chainstay. Then maybe a wooden platform (cutting boards from Walmart are $7.00 and nicely rounded solid wood).
-Lowracer-

I measured my Razor wheels (the fat 10"X3" air tires) & they would fit in the fork & rear dropout with small spacers. I think the weak link on my mock up are the kiddy bike wheels. Not so much the strength of the spoked wheel, but the axle bearing interfaces. Not sure these kiddy bike wheels (w/ training wheels) were meant to roll around at up to 30 mph with a 175 lb. guy on them...lol
Not sure which way to go just yet, but I'm in no rush like I usually am.
I do think a regular old BMX bike with the 8" upright handlebars would be a perfect starting point to make a stand/sit motorized scooter.
I may leave the stock 20" front wheel (406) to keep the sweet front v-brake & use the small 12" kiddy bike wheel on the back (need space for engine mount & floorboard). Alot of these kickbikes have the big front/small rear wheel combo.
The Izip is a deal for $30 before haggling, but I really dont have any extra room at my house with 9 bikes all over the place...lol
-Low-