I used this drawing to build 3 perfect working FDs.

[Mercurius]

A Harbor Freight mini mill was used to drill and mill the 4" aluminum channel. Hope this helps anyone out there.

 

[happycheapskate]

What else did you use? (staton parts?)

 

[loquin]

I'm curious as to why you crossed out the 71mm spacing on the drawing, and changed it to 70, since it should be 70.7mm (and therefore closer to 71 than 70.)