Tom, what are you building?
A prepunched kit like a 10 is not overly critical with this, but an early design like a 3 it is critical to have an accurate jig-----and that can be done on a sloped floor, but it would be subject to needing reriging if you moved it.
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Mike Starkey
VAF 909
Rv-10, N210LM.
Flying as of 12/4/2010
Phase 1 done, 2/4/2011 
Sold after 240+ wonderful hours of flight.
"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."
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