Daughterboard should tell you (in plain English right on it) whether its a normal SI or deluxe boardset. The larger board won't matter and usually isn't labeled.
Make sure all the other parts are there...the power supply pcb on the left (looking from the back)...power brick, the backdrop (curved plastic), and black light. Monitor chassis should be there right under the tube.
Try turning it on...as long as you get some kinda video (garbled, whatever) at least that tells you the monitor works. If you get a solid raster...that either means a monitor or power issue.
Make sure no wires are cut or plugs hacked off.
Should be fairly easy to find a Midway coin door, but the proper "gray" one may be a little harder to come by.