This jig is easily made from 8020 extrusion and connectors. The rest of the small parts and materials are all available from McMaster Carr. For tools you will need at least a drill press, drills, and some metric taps.
Yes, I know that's a carbon fork in the picture. Shame on me. It was close by when I took the picture.
Step 1: Tools and Materials
1 - 8020 #1530L extrusion, 24" (28" if you're building 29er suspension-corrected forks)
1 - 8020 #1530L extrusion, 6"
2 - 8020 #4350 4-hole 90deg Joining Plate
1 - 8020 #3330 Universal Pivot Nub
4 - 8020 #3879 Economy Double T-nuts, M8
15 - M8 x 16mm button head socket cap screws (8020 #3813)
15 - M8 washers (8020# 3860)
1 - M6 x ~20mm socket head allen screw
2 - M5 x ~10 pan head allen screws, like used on SPD cleats
2 - M5 by ~10 socket head allen screws
1 - 1"x1.5"x1/8"t rectangular aluminum tubing, about 2"
1 - 1" (or close) aluminum round bar stock - about 6"
1 - Aluminum V-block McMC# 20065A8
1 - Toggle clamp McMC# 5126a17
1 - front axle from junked hub
4- axle locknuts from junked hubs
Drill press or milling machine
Layout fluid (optional but helps)
McMC = McMaster Carr
8020 = 8020, but they sell through local distributors. Check their website for the nearest distributor. If you can't find one nearby, I can heartily recommend F & L Industrial Solutions.