Beautiful sheet metal work, Rob. I'm impressed by your progress. Yes- we're talking about oil pan access- the first of two access problems in a stock Pantera is the complete inability to remove the oil pan without raising it up a foot or two; most pull the engine/ZF. Rookie mechanics that assemble a 351-C engine for the first time sometimes install the oil pump driveshaft with the limiting star-washer missing or improperly positioned. Then someone else pulls the distributor, which lifts the little driveshaft up. Then it drops into the pan. And you cannot retrieve or reinstall it correctly without pulling the engine because the pan cannot be removed.
The other is, the fuel tank cannot practically be removed without pulling the engine. Moisture-holding crud builds up behind the tank, causing rust and sometimes structural damage.