$ amount item # per 4x4 panel purpose
80 1 8'x4' 3/4" maple plywood .5 main panel
35 1 4'x2' 3/4" plywood .25 french cleat
40 4 t-track 3 peg rails
5 4 1/4" wingnut 2-4 track end stop
8 100 8-32 x 3/4" metal screw ~15 fasten rail to wood
8 100 8-32 nut ~15 fasten rail to wood
8 100 #10 washers ~15 fasten rail to wood
10 100 #8 1 1/4" construction screw ~5 fasten french cleat to plywood
10 100 #8 2" construction screw ~6 fasten french cleat to studs
12 20 t-track bolts 1/4" x 2.5" 10-20 small pegs
14 20 t-track bolts 5/16" x 3.5" 10-20 large pegs
16 25ft heat shrink 3/8" 3-6ft thread cover
1.5 8 5/16-18 nut - end caps on pegs

Price per panel (4'x4', 12' of rail): $84 Price per peg: $0.86 panel + 15 pegs: $96

alternative: cheaper plywood instead of the nicely finished maple stuff. alternative: #8 x 1/2" wood screw (100x), instead of 8-32 screws+nuts+washers. I prefer using nuts rather than trusting the 1/2" screws in 3/8" of plywood. alternative: vinyl tubing, instead of heat shrink. Much more work to install onto the bolts.