Welcome on board, paulinfrance, and thank you for this nice picture.

I don't have the JU87 Marutaka plan ( I whish I had to compare with mine to look for modifications introduced by M. Kato for Marutaka kits) but I have the MK Junkers J87 D-5 which is very similar in size and design. average scale is 1:7.3 , yours is 1:7.65.

My plan is showing a CG at 10 cm from leading edge, on the fuselage plan, with a wing cord measuring 41.5 cm at this location. CG is easy to check: it is exactly corresponding with cockpit side of fuse former F5 ( instruments panel).

It looks very conservative also, being pretty much on the forward side.

Happy landings!