I think we've all been there at one point or another. Keep a chin up, get back at it, usually you'll find a host of little gremlins you might have missed. Milkshaked the Moo her inaugural run as well (Also damn near sank it due to one missed hose clamp I didn't tighten). Cleaned her up, fixed the hose, fixed the leaky water outlet cover and water pump cover, was back in the water in about 3 hours.
The burning oil, well, that's not a good sign, but not unfixable either. Losing oil pressure could very well be directly related to the milkshake, as could the burning oil, but yeah, the engines prolly gonna need to come out and apart for a good going through. (Could also just be a head gasket(s)). Still not such a bad thing, nor that long. Look at Crewcheif, he got his BBC done in a few weeks, and is doing it again due to unforseen circumstance! (And I have no doubt it's prolly near done right now!)
Ray