You're installing hyds anyway, why wouldn't you make the steering hyd too?
And with a motor at each wheel, that's almost like two locked axles, it'll take alot of power to steer. Hyds is way smoother action & stronger. 9mm bore with 2mm plumbing, it'll steer plenty quick & save you alot space.
Make your cyl housings from brass, then you can solder most of it together & bolt the rod cap on to change seals when a leak develops. Are your pushrods stainless steel?
12mm bores for loader/bucket & 9mm for steering, 2mm plumbing throughout & belt drive with reduction between your pump & motor... should be quite a hardy working loader.
