Just taking a few steps back and re-reading your first post;
How did you 'manually check' the oil level? My fear would be that you might now have over-filled the engine now if your oil level sensor has packed up and you miscalculated the loss quantity. If you have over-filled then it would become catastrophic to start the engine up due to the pressure buildup that would take place. Make this your primary consideration before doing anything and get the oil level clarified.
2nd, which part of the 'undercarriage' as you described it, is 'raised next to the oil leak' ?
If this is the impact point of the 'grounding out' then it may help to narrow down where the leak is coming from. The main seal guess was just a guess based on your description of the leak location, the clutch smell (out of alignment now?) and the fact that the engine bay is bone dry.
It could actually also be that you have whacked the sump and the oil has travelled/dripped backwards along the inside of the undershield to an exit point.
In any case, don't start/drive it before clarifying the oil level and get it recovered as others have suggested.
good luck.