Cams should be "under pressure" when you reach tdc. At least on drivers side of motor. You can still install incorrectly and spin by hand complete revolutions. Timing can be off enough to not run, but not hit pistons with valves. Yes, if hitting, you would feel it by hand.
See if the ECM will take another flash. If it reads and writes...
If you flashed Cobb OTS map and Shamars map and both took and car will not start with either, you already proved ECM is communicating in read and write and that condition exists with multiple tunes. So.. electrical or mechanical error during installs.
You really need some more tools to continue trouble shooting too. At least a test lamp to verify injector pulses, tester to verify spark in cylinder (or at least a multi meter to test the coils) and a good old spark plug tester to set a large gap outside the cylinder. A fuel pressure gauge to verify fuel too. It would be nice to see a log of start up attempt. Is there an rpm signal? Is there a voltage signal? What position is the neutral switch.
Remember too that the immobilizer can kill fuel and spark. So there is the BIU, antennae (in tumbler), the key, the immobilizer unit and then the ECM in that chain.
Lots to look at. Big can of worms got opened on this project. In the end it is probably something fairly simple to fix. Finding it is the journey.