Thanks for the comments
@ Glen - At first sight, the Mk.Vb, MK.IXc and Mk.Ia have parts with the same shape. I didn't measure them to check if some correction was made
@ Erik - well, this is a clear case where forcing the skin to close is not a good idea. The Brewster Buffalo, also from Halinski, is similar.
@ Isaac / Falco - Regarding the canopy, you know what my taste is
The open canopy would help make the interior visible but the plastic accessories are so transparent that the difference is very limited...
The left panel is full of the detail we expect from Halinski. Frankly, I find it fun to assemble!