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As a plumber and looking at your drawing I would highly recomend an access panel from finished room to get to the plumbing.
I say this not for installing the shower because a plumber could install the shower pre-plumbed then slide it into place but these shower valves will not last for ever and if done this way the whole shower stall will have to be taken out again.
The drain is a typical rubber flange shower drain that after the trap is all installed EXACTLY where the drain is on shower and at proper height about 1/2 lower then the shower floor when in place, a greases rubber gasket is pushed into place with a screw driver.
Gerry