I need help for M-36 Jackson

[japa]

Hello, I'm japa (a member from Spain). I'm freelance illustrator and animator. I make by hobbie some WWII 3D models (M-3 Grant, M-10 Wolverine, U-bot, SBD Dauntless...you can see a view of my wolverine) and I need help for make another vehicle, a M-36 Jackson. I have a lot of pictures of this tank destroyer (by the other hand, any can say me if Canadian Army use Wolverine or Jackson?) but I can't find any blueprint for tower (body is similar than Wolverine).
Any member can help me? Thanks a lot