I've looked at Gapcoin. I even mined some a while back. They were recently delisted by Cryptopia. I could probably create a 0.16.3 version of the code. I'd be far more interested in doing that if others here also contributed. There are some possible issues with the coin that I would like to see addressed before doing any work on gapcoin.
Yes but delisting is so common these days. There will be tons and tons of delistings over the course of the next few months.