[DanEC]

Originally Posted by 427SSSS

(Is this lower cut going to be a separate flip down door section or are you going to have it grafted to the door panel to end up with an enlarged and lower threshold door and door opening when completed?)

That's a mouthful, I've read it three times and still not 100% sure what you are saying.
Piano hinge at bottom of 2' cut out, door is 28"+/- height, second piano hinge at top of door, drop door, unfold second 28" panel, have 5'-6" long ramp, to reach 5-1/2"" height of Bennett cobra floor, didn't take time to do exact math, but it's damn close to ADA requirements.
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OK - I think I get it. The original front hinged door goes completely away replaced by a two-piece, hinged at the bottom door panel that folds down like a PU tailgate and then the inner door panel section unfolds out on a top hinge and extends further out making a ramp. That's going to take some thought and structural consideration to support possibly 225 lbs or more and still fold up compact enough to allow torso and shoulder room.

Good luck