The problem with doing the Chippy wing and others like it is the design of the TE itself. There almost isn't one. It is a very small strip or cap (1/8" x 3/16" or 1/4") applied AFTER the wing is built. The trailing edge really consists of the sheeting top and bottom with an open gap between them until you put the cap on. This way leaves you no rigid edge to key from or mount in a jig. This works only if built on the board. These were common in the day of the cloth hinge. It stinks in the time of nylon hinges. You must either stuff some balsa blocks in behind the cap or change the whole way it is done back there to give enough 'meat' to sink a hinge into. I chose the blocks on the Lark. On my designs I use a 1/4 square TE which is what I jig, then lay sheet on top and bottom. This leaves a TE thickness of 3/8" which work peachy with 5/16" or 3/8" flaps. Some of the old designs used 3/16" or 1/4" flaps which made the thinner wing TE more desirable. The Magician used stiff 1/8" flaps- near impossible for slotted hinges.
Ahh, arrgh, it's
that type of T/E. Yeah, they're a bit more of a pain.
With them, I've still fixed the L/E parallel to the board as described earlier. (Actually, and ideally, I'd start by pinning a spar down to the board before setting the L/E if possible, depending on the design) If it's "fish mouth" ribs you can start with the spar as mentioned then go right to my next step below**, waiting to add the L/E last once you're finished with assembling the T/E. That scenario negates the need to even fix the L/E to the board.
**Regarding the T/E assembly, (assuming the ribs have no "feet") I've pinned down a piece of square or rectangle stock to the board, full length spanwise, to use as a reference for setting the rearward portion of the ribs on. Fasten this full length "reference" piece parallel to the T/E just far enough ahead of where the "sheet" for the T/E will be to get the centerline of the rib airfoil to sit parallel with the board. (you're simply supporting the rear portion of all the ribs with this piece) As you progress this full length "reference" piece then serves two purposes, it allows you to assemble the wing straight by keeping the ribs against it, and also gives you a handy spot to pin that part of each rib to.
This routine isn't the easiest thing to explain in type,
and I'm not saying this is the way it all has to go, I'm just saying I've done it this way many times with success. To each his own...