Welcome back Marine.
1. Pouches are usually sourced from loads of places, so I wouldn't worry too much, unless you're only after SU stuff? Mine come from a gun holster pack (tiny pouch) and a med kit (large pocketed pouch), both OD.
2. I just used a length of black elastic, joined by a pop rivet.
Here's how it looks:
3. Again, if you're after SU boots, just keep looking around on auction sites, although on a recent post the other day, someone had found a UK supplier of really cheap ones.
Double edit: Here's phil talking about the boots:
http://forum.alienslegacy.com/viewtopic ... 2684#32684
Edit: Beaten to it.