1.Plastics? DC, NOS or find some resonable second hand ones and polish / paint - not many other choices
2.foot pegs - Chinese Wide ones - under $30 look for PW50. They use the same springs and pins. Bolt 'em straight on
3Pipe? ( possible) - DG is about the only choice pretty well priced - otherwise look for a good used one - getting harder to find
4.Do I powder coat frame or paint? - many threads on here debating this one
Do a search and spend hours reading
(I would paint - $3 rattle cans for easy repair on a race bike)
5.fuel tank .Do I clean or paint? If you are going to put fuel in it I would sand / polish it.
Just my opinions there - I'm sure someone will correct me
Just do me a favour and don't paint the hubs in gloss