Okay.. You're gonna want to bolt the foldy at a normal angle, so get a 2 inch long 7/16" bolt for behind the foldy. Get your normal 2 inch long 5/16" bolts, 2 of them. Now cut off the plate in the front with a hack saw. But the bottom bolt in first, then the 7/16" in behind the headtube in the hole, not in the open sliding part. Tighten those up. Now dril out the slot a little and put the 5/16" bolt in there. It should make it about the same angle as a Pro Model and it's super solid. I ride it like this and it's perfect.
Now you're gonna wanna put some type of alu bar if you can, i've never tried it but my deck is getting fucked from ice picks.
And the rest is just like modding a regular scooter.