I just built a strongback from rabbetted MDF to 2" x 4". It has couple of little curves to it.

Nick's book is based on a "2x4" strongback and forms that have 2" x 4" holes, so you can true the forms on the strongback by taking advantage of the small difference, by shimming or using cleats (page 74). By building a true 2" x 4", I seem to have lost that option. I have no way to move the molds to accommodate the wiggles.

Did I just screw up the strongback bigtime? If I do it again, might I get it right? Should I try planing the MDF strongback to true (but no longer 2")? Should I toss this MDF strongback and go back to 2x4's, ala Schade?

-Robert