Looks like you have a way to go to get this to fully seat. I tried to balance a good fit with being able to reasonably assemble, especially with a print that's less than perfectly printed, but elephants foot will kill the assembly of these parts.
I can post the STLs of the hole plugs as I just sliced them out of the body, then you don't have to worry about matching curves. Would still require glue probably as I'm not sure the curved surface would take threads well. As for covering the backside, that's up to you, but you'd have to figure out how to get the wires through the cover. For what it's worth the access holes on the top are completely invisible under the hood, and I drove through some heavy rain and not having the backside covered did not lead to the gauges getting too wet or anything.