Finally got around to super-gluing the Quick Boost resin barrel to the OA-4M now TA-4H kit. I obviously have a lot of work ahead of me to blend everything together.
All hail having a good stockpile of sheet plastic. Built the aft bulkheads from flat sheet plastic. The ejection rails are very thin tubing, still a bit over-sized since I cut each rail to a length of one inch. Used a magic marker to keep track which bulkhead goes where.