It is a bit unconventional I know, but I am building this thing for my own use and comfort is a determining factor for me.
You think the standard ones would be ok? I dunno, they seem kind of loose and jerky to me. I am rather partial to the ball bearing roller type. Guess I Just like that smooth feel when it rolls out. Plus I think they'd hold up better to any 'intense gaming action' they might encounter.
Take a peek at the pictures I posted at the end of my proj announcement thread --->
http://forum.arcadecontrols.com/index.php?topic=58145.0 and some of the following might make a little more sense.
I was going to mount the rails under the top part of the control panel and inside the side panels, from the back up to where the joystick/buttons are planned to go. That should give me enough stability.
The 8" of outward travel will be enough to avoid bad posture while seated for extended periods and make the whole thing more comfortable to use. You can't really see it in the pic but there is a slight incline towards the back of the CP, this should help with in/out stability but figured detents at the ends of rail travel would be best for avoiding unintended movement.
My problem so far is finding the rails I need to fill these requirements. There are gazillions of different types out there and I am not sure what kind to ask for.