I typed "fuselage jig" at http://www.google.com and got several results that are RC related as well as some that are not.

There is a fuselage jig available from Scratch Builder Warehouse
http://www.scratchbuilderwarehouse.c...y_fuselage_jig
A couple of home built fuselage jigs
http://www.nwrcc.com/viewpage.php?page_id=20
http://sam27.com/fuselage_jig.htm

I've only built three kits (all from Great Planes) and they are designed to build straight, without jigs, on a flat surface. I think most modern kits can be built without jigs.