I have found different little things you could use for the construction of your pack. All things will be listed by part name, then what to use for it.

Ion Knob - small sized mediceine bottles and film bottles work great. paint black, and add a 1" washer on top.

Spacer Disk/Vac Hose Plug - you can use a sholder spool from Radio Shack. Just get some sholder, take the sholder off, and cut the top off. paint, glue, and plug the hose in. youre done!

Clippards - get 2 Pert plus travle size/trial size bottles (K-mart), and a peice of 1" dia (inner dia) PVC pipe. empty the 2 bottles, and cut out the bottoms. take the PVC, and stick it in the bottoms of the bottles, to help re-inforce them. cut to the right size, paint, and boota-bing!

Hope this helped ya!