I did a dry assembly tonight to make sure it would work the way I want it to. As I mentioned the vice/clamping side of the vice I wanted to move up a little, but wasn't sure if I needed to cut the opening out to get good clamping on the stock. turned out it worked fine. It's connected about 2" from the end. I'm probably going to use this area to clamp the base to the work bench for longer heavy barreled rifles.
I recessed the wingnuts on the back, mostly as I didn't have any 3" bolts, but actually looks nicer and don't have to worry about scratching stocks on them by accident.
This is one of my longer guns I have, but have one or two that may have heavier barrels than it. But you can see that it could get a bit lopsided without a clamp holding the Butt side.
The clamp was barely wide enough to clamp this one too, but it did.
This is one of my smaller rifles a Winchester replica .22 pump. The cam was barely big enough to clamp this one, but it did. I may still make a larger cam handle.
I just had the two side rails in the bottom sitting there unattached, need to go through my supplies and decide what all I need to make homes for in the base to have things at hand. Will disassemble, sand, do some round overs, finish, and add leather in the rests for padding. I also want to make an adjustable mid support for cleaning the rifles that hinge in the middle.
Rob, I think the sliding extension would be a good idea, will have to see if I can incorporate perhaps and additional support.