I would try starting fluid again. It's not satisfying as far as puzzle-solving, it feels like cheating, but it really will tell you if the spark is happening at the correct time, and the intake system is open. If you have a remote starter and a can of starting fluid you should be able to run the engine for minutes all by yourself. On a cold engine it's not a big deal, it won't hurt it. On a warm one you can get some detonation so don't overdo it.
Beside that, don't overlook the exhaust side. Any chance the exhaust system is blocked? The air has to be able to flow all the way through. You said all you did was install a turbo. Turbo is part of exhaust.