I'm glad to see this thread is helping out. When I first joined, I was a little dismayed at the prices I'd have to pay, so seeing budget builds really gave me hope.
@Got2bfett: You could just use sintra if you have trouble, provided you have it lying around.
I've cut up some random tubes I found a while back and a pen to provide the knee darts. Again, screen accuracy is an issue, but after I bondo the holes I made for them and add paint, they should look the part.
After a lot of humming and hahing about the gauntlet rocket, I decided to give it a shot making it myself. I initially tried a pepakura model, but it turned out far too delicate for my hands and I considered buying one. My problem was that these gauntlets are significantly scaled down and a regular rocket won't work. So back to building one. I'm taking this one step at a time. Using dowel (or a chopstick in this case), I skewered four Humbrol paint lids to it after finding they were the correct girth. I used some PVC pipe for the back tube with a cap slotted over it, but unfortunately I didn't have any pipe that fitted over the Humbrol lids, so I rather messily wrapped some sintra into a tube. The lip of the paint lids will provide a support and contact point for the glue and four lids, arranged as in the picture will provide the length of the tube section. Bondo will level out the messy sintra warpage. The pieces are currently unattached and the picture shows the second sintra tube seperate to show how it goes together. As far as the front end goes, let's cross that bridge when it comes to it.
The jet pack has been resined on the front with some extra thickness added to the top edge. Now it's ready for bondo.