6 x 72 belt & centerless grinder project

[metric_taper]

OK since we don't have the old tools in progress sub forum I wasn't sure where I should post this one as this is not a tool yet.
it will be my next major project build.
A 6in. by 72in belt grinder with a powered counter wheel for centerless grinding / polishing function. additionally it will be able to be used either vertical or horizontal. when in the horizontal position I will have a feature by which I can use the tip roller as a notcher for tubing.
I am developing a double acting 2 or possibly 3 stage hydraulic cylinder and will need this machine to grind and polish the OD of some of the tubes as the correct sizes I need can only be bought in large quantities on special order. I can't justify spending several $1000.00 for a prototype cylinder the tubing I already purchased honed to size was already near a $1000.00
Since I have a 8 hp motor the bearings the steel and will make the time I figure I will come out ahead of the game
here are some Jpegs of the drawings I have so far. there are a lot more details I need to work out but have some of the items already machined and cut for the project.
<snip 2 photos>

Does the wheel "powered counter wheel" spin the shaft when it's in contact between the belt and this wheel? Then the hydraulic cylinder, does this drive some support that holds the work in such a way it spins freely and without centers in each end as a power feed? From your description, I think your making a piston shaft from tube material for a hydraulic or air cylinder.
I've never heard of a centerless belt sander type grinder.