I did watch that one, forks wont be a problem as we can buy something premade for the job, other thing I'm figuring out is how I can make the reloading easier and potentially able to provide a bigger punch than what my normal hand draw could.
Worst comes to worst the Original 25s stock is still off, I can trace its outline and scale up where it's needed to be longer or beefier, maybe inlaying some steel plate for bracing.

I reckon we could make quite a cannon if we can get it to work.