This could be a lot of fun but it could also break down into quibbling over details unless there is a bit more structure. Topics I think we ought to reach some agreement on:
1) What are we weighing? My own vote would be everything you leave the trailhead with less the big 3 consumables (food, water, fuel)
2) What weight constitutes UltraLight? 15lbs FSO? 20? 10?
3) I’m a big fan of MYOG but I think to be fair you have to cost it assuming that you start with no tools and include the tools cost. If you buy a tool that can be used in making more than one item then you can split the cost between the items.
4) I’m also a scouter and appreciate that a majority of 11-17 yr olds aren’t gonna successfully sew a tarptent or pack or insulated jacket but I wouldn’t let the needs of youth group leaders rule the roost on this. Most of us are capable of picking thru the submissions and assembling a kit using the pieces we find workable. Notice that I did *NOT* say that youth are incapable of sewing … just that you’d go broke if you bet on 100 of them sewing their own kit.
5) When using recycled items (a can for a pot, a soda bottle for water etc) I’d vote that the cost be $0.00 as long as it is from an item that the mythical typical person might reasonably use in their day-to-day life.
6) Regarding sale prices … I’d be OK allowing verifyable nationally advertised sale prices. Example, REI brand nylon convertable pants are typically priced approx $50 but anyone who watches their sales for a year will have 2-3 opportunitied to buy then for $35.
7) We do need to set a minimum temp. Here in MN, 20F would cover most 3 season work. But what ever is agreed works for me.
8) Lastly, I’d vote that if the consensus is that an item can serve multiple people you ought to be able to pro-rate the cost and weight. Example, if two people can get by with an 8×10 tarp for a sleeping shelter I’d vote to count half the cost and weight.