Please don't take offense but there are several things about your bike that are worrying. Some of them you may know about and have planned to take care of later but in the interest of safety I'll bring them to your attention:
The girder fork you are using should have parallel links, otherwise they will bind and not work properly.
Frame splices should be "slugged" to assure that the spice is as strong as the original frame member.
The reused front fork that you are using for the rear chain stays doesn't have have much room at the dropout for axle/chain adjustment.
If you cut your frame and fork to make it lower, none of the tubes will line up. Realigning them would be extremely difficult.