Thanks for helping me out, there, Arne. I still can't get the hull image to display on a PDF export.
Yes, I think the weaverbird planform will work here, so long as the mast position fits in with the accommodation. The partners need to go right at the forward end of the coachroof, further back than your planform.
The mast length of 44ft is just enough, if the heel of the mast is at the waterline. The sail might be raised a bit higher, and the halyard drift reduced, if the halyard is rigged as I prefer, with two single blocks at the masthead, and a single and becket on the yard, giving a 3:1 purchase. A self tailing winch then makes up the required power. I used, and recommend, an ARCO 30:1 / 14:1 two speed self tailer for this size of sail.
I would need to adjust the sail to add a batten. Weaverbird only needs five sheeted battens, but this sail will need six sheeted battens. Separate upper and lower sheets are highly desirable to control twist.
The batten length is 5.11m, and the yard length is 3.79m, with a lightweight extension ft to ensure that it stays the right side of the topping lifts.
I would strongly recommend that the cloths are laid parallel to the leech. The sail is 5m wide, so using 1.524m wide fabric, 3 1/2 cloths are needed. This puts the seams just where they are needed to add broad seam at the forward two seams ( no broad seam at the aftermost seam, to keep the sail flat here). I would draw out the panel shapes needed for this method of working. The tablings would be 60mm wide, turned in twice, so an extra 120mm of cloth needed at both luff and leech. NB no webbing required, and certainly no hand-sewn bolt rope - we're in the 21st century now! It wouldn't help with the real-life issues that a junk sail faces. For long-term, ocean-going use, a doubler, 300mm wide, is added along the leech before the tabling is turned and sewn. This adds weight and stiffness to prevent flutter and cloth breakdown. Another doubler might be added in way of the mast on the lower three panels, as the pinching that occurs between battens and mast when reefed is another cause of damage.