Noob in desperate need of help!

[92civicex]

Hello everyone! I'm hoping someone will be able to help me out. I have a buddy that bought a 1st gen with a rebuilt 13b motor in it and he's having some problems getting it started. I've owned a few RX-7's and so has he but its been a few years since we've had one and this one is giving us fits...

When he bought it, it ran perfectly! He drove it back and forth over 100 miles a trip a few times a week but suddenly decided that it wanted to drain the battery if it sat for more than 24 hours. We replaced the battery and moved it to the trunk and problem was solved. Then we started having trouble with the battery again, alternator went out. Ran fine for a little while longer then finally while coming back from the auto store, it decided to blow an oil line and empty the oil supply on the ground. We towed it back to the house, replaced the line then pretty much let it sit for a few months because other priorities came up. Now we are trying to get it back up and running again but can't seem to get it going.

When you try to start it, it makes one turn over then dies, lights dim and everything like the battery was bad again. We took it to the store, charged it up and put it back in the car, same thing. Then though maybe the starter was bad, went and had that replaced too, same thing again. We are stumped and not sure were to go from here. Do you think after the oil spill it destroyed the motor? We want to do a push start but nervous that it will do more damage if there really is something wrong with the motor. He tried to turn over the motor by hand but it wouldn't budge. I'm assuming that's bad news. Does anyone have any suggestions on what we could try next?

Again it has a brand new battery, starter, and alternator.

Any help would be greatly appreciated and again I've been out of the rotory world for way too long so I'm a little rusty. If I've left anything out just ask me and I'll do my best to fill you in.

Thanks!