Could you expand a bit more on the process to making everything fit? What skin did yo
The Fastback mod is fairly easy.
After rolling fuselage shinny side up, you need to cut bulkheads F305, F306 and F308 off and leave 2" above 1/8" longeron.
Bulkheads supplied by by Harmon Rocket LLC are notched for the longeron which was extemely helpful and accurate for alignment. Pulled string line along top to check bulkhead alignment.
Width for F306 and F308 was off about 3/8". I had seen this problem in the HR section on VAF. I cut these pieces at the top and added a 3" filler piece at the top to fill 3/8" gap.
Used 1/8" flush rivets to attach HR bulkhead mods. Flush riveting facing fwd on F305, and flush riveting facing aft on F305 and F306.
Installed plywood and bracing to hold everthing in place before skinning, see pic.
In rough cutting the skin from 4 x 8 sheet I added an extra 2" to measurements and I would encourage this. Used wife seamstress tape to pull measurements.
For skinning I pre-drilled the bulkheads first to establish spacing and alignment for rivets. Skin was held in place with ratch straps and I climbed inside to drill skin at bulkheads from inside to out while wife placed clecos on outside.
Holes for longeron were already drilled, used hole finder to set skin on longeron. Released clecos on one side and drilled remaining holes clecoing as each hole was drilled. Reset bulkhead clecos on other side, released clecos on side just drilled on drilled longeron on other side.
F305 bulkhead was drilled last, and I released bracing and sighted the fit before drilling inside to out.