For a stem, I reckon you can't go past a kalloy uno. Cheap, very light, seems stiff enough for me. I got the 7, but they also do others, such as a 6 - different alloy, dunno what the practical difference is. Plenty of sellers on eBay.
I see that you have a cheap second hand shock in mind. If that doesn't work out,I highly recommend a manitou MacLeod on that frame. I have one on pretty much the same frame (a fm058, which only differs in rear brake location), and I am impressed with the MacLeod.
Given the high main pivot on this frame, make sure you run at least a 32t chainring on that bike. 34t is probably even more optimal. There have been some with this frame running a 30t chainring, and some get weird suspension movement, which sounds like extreme anti-squat. The bigger the chainring, the more active the suspension will be under power (go too far, and you'll get more Bob though, needing a remote lockout).
Before you build, make sure you get some capgo noise protection, to slip on the rear brake hose and derailleur cables, at least over the span within the downtube. I regretted not doing it at the start, and it cost me a lot of time mucking around with it (to get rid of annoying cable rattle).