Does anyone know to steps to take over an abandoned coin/project?
1: Try and get the latest source or, failing that, the binaries.
2: See if anyone is running a node/check the last known node list.
3: If the network is not active, and you cannot sync or source a blockchain or contact any possible users, you will have to mine a new genesis block and start with two nodes. You need the source to do this and it wouldn't harm to change the ports etc to avoid collisions. Frankly, I would fork a modern coin and just use the old name and then relaunch. No current userbase so make a relaunch ann on bitcointalk.
4: If the network is active and you manage to sync - there must be some sort of userbase - make an Ann and offer to take over. Update the checkpoints and then release a new version to your new and loyal userbase of bag holders!