Yes, but why don't you just buy those parts (higher quality versions) direct from Warmoth for same price minus extra shipping charges? The capacitors and pots from Stew Mac aren't great, the diagram is available anywhere if you need one, and you can combine the shipping cost with your warmoth body. If you are DIYing, get the best components from the start.
4 x 500k long shaft pots
1 x Les Paul Toggle Switch
2 x .022uf capacitors - Orange Drop or go to radio shack and get the green chicklet kind
1 x switchcraft jack
Some wire, of any thin type.
That's the whole "kit" plus this: http://www.seymourduncan.com/support/wiring-diagrams/schematics.php?schematic=2h_2v_2t_3w
