This is the Velox OR1, another ship I've built. It's brought up to speed by five liquid fuel engines and then five subsequent SRBs, and it requires no SAS modules other than one at the top. It's ridiculously stable. Will get you about 1 fuel tank to work with once in orbit if piloted correctly, more than enough for anyone. I have not attempted this yet, but it's also likely escape capable, though it may come just short.