My flat scooter is:
Old A deck + head tube bolted
Stock pro forks
stock pro handle bars bolted
gm front and stock bw
reds
fomees
Light as - - - - and super fun and didnt cost more then 20 bucks to build
They look pretty sick, idk, i have a green machine in the front and a agent orange in the back anf they're holding u good. I guess indoor and outdoor dosent make a difforence.