Randy
Not sure what exactly you are trying to do but you mention clamping boards together. I do this all the time and the best clamp I have found were these.
PRO-Grip Straight Edge Clamps
What is nice about them is the versatility. You can glue up boards. You can clamp the clamp to the workbench and glue up boards. You can use them as a straight edge guide for routers and saws. You can make jigs to go with them. They are costly but get a few sets of different sizes and they will last a lifetime. I have them all the way up to the 8 footers. I had picked mine up at woodworking shows because they always had package deals. If doing any kind of board gluing these are the best.
But with that said you can always go to the tried and true reliable bar clamps. Pretty reasonable.
To do something like the other poster shown I have 2 "T" tracks on my workbench that I can use toggle clamps off of. That maybe another way to go. With that system you again have so many options and you can use many toggle clamps at once.
