I built one to run sprint car motors on that has castors to be able to roll it around (sorry I don't have any digital pics to attach). Since we don't use a flexplate or flywheel in the car and we run the p/s pump and fuel pump off the back of the cam (yes-between your legs), I had to make the stand so I could move the flexplate away from the motor enough to allow room for the fuel pump to bolt to the rear of the motor plate (obviously, don't need the p/s pump).
I bolt the u-joint to the back of the crank, same as in the car-it has a splined back half for driveshaft to slip inside. For the driveshaft, I took a jeep driveshaft with the same splines and shortened it to about 15" oal. The other end has a rear flange welded to it off of a busted steel crankshaft that I can mount the flexplate to. There is also a 1 7/16" solid cold-rolled shaft at that end of the driveshaft that protrudes a few inches past the flexplate-this is where I have a pillow block bearing to elevate the driveshaft roughly inline w/ the engine crankshaft. The racing starter mounts to a heavy plate to engage the flexplate without (wait for it--flexing!).
There is a steel shelf that sits in front of the radiator that houses a 5 gallon alcohol jug and has room for 2 batteries. It takes a lot of juice to crank over a 15:1 motor fast enought to start it on alky with 16 injectors! Sometimes we'll take the pump off and spin it with a drill to prime all those fuel lines before starting the motor. And of course I have a oil pressure & water temp gauge as well as a master fuel shutoff. We can run the same headers that we run on the car. Sounds wierd when you roll up the garage door and have the headers aimed outside-but it sounds really good a block away!
One tip-don't ever mount a battery close to your driveshaft! Originally, I had it mounted next to the driveshaft (about a foot between them), with a big heavy guard over top. Well, when the first driveshaft I made broke (motor was idling-about 1400 rpm), it busted through the guard and broke the battery-sending battery acid flying. I still have the jeans I was wearing that are beautifully air conditioned from acid burns.