Wow, they welded the patch panel back on? That's a lot better than the guys who just use duct tape or sticky foam. I've seen a few real hack jobs (not in person, just in pictures or on video).
One issue with cutting your own access panel is that if the fuel lines weren't designed to be disconnected there on top, you'll have to cut them too and re-connect them with appropriate fittings and clamps. It really swings the advantages away from making the access hole.
Over on the 3rd Gen Camaro forum, there was a guy who had a mint-condition, low-miles '92 Z-28. Might've even been a convertible. Anyway, when he needed a new fuel pump, he took it to a highly-regarded local shop. So the next day, he decided to swing by on his lunch break to check on progress. Lo and behold he found the mechanic in the rear hatch area with his cutoff wheel, just about to start cutting a hole. Not what he wanted and certainly not what the estimate was for!