I am in the process of rebuilding my '90 Schwinn 434. Instead of using the old 7sp stuff off of the 754 I have, I am going with a 9sp setup. I just want to make sure that the parts I want to use are all going to be cooperative. I plan to buy/use used parts where I can to save some cash.

I have a Shimano 2200 (8-9sp) rear hub laced to a Weinmann LP18. i bought a 9sp Ultegra CS-6500 (12-25) cassette.

i have a triple front crank that i would like to use, but it's older and idk if it will work with the 9sp setup. It's a Sakae Custom off of a ~'82 Puch Maxima. if not, i need to know what i need to buy. i don't need a triple, but i'd like to if i can do it cheap enough. i don't want a compact. (square taper BB)

i went by the LBS yesterday and asked them about what i was planning on doing. they said that i would need a long cage RD to use a triple w/ 9sp. is this true? will a 10sp RD work with a 9sp cassette/shifter?

i would like to use downtube shifters, but i haven't ruled out an STI setup (if i can get it cheap enough). are there any 9sp DT shifters? i see some 10sp DA ones on ebay, so i would assume so. will 10sp shifters work with 9sp cassette/RD?

if i use a triple crank, i need a triple compatible FD, correct? does it also have to correlate
to the size of the cassette? is there a 9sp triple FD with a 31.8 clamp?

is there anything i'm missing? sorry for the very newbish questions, but i want to make sure i get the right stuff.