Welcome to the Forum, glad to have new folks and especially ones with talent. Beautiful bus, look forward to seeing it and you some day. I checked your schedule and I sure hope you or the bus do not get sick, as your gonna be a busy man.
Suggestions for the diesel ordor. A little raw diesel goes a long way in stinking up the place. Kinda reminds me of the taco tour with JDUB and Mango. A little taco makes a big stink. Back to the diesel. Notice at your fill neck if the compartment drain maybe clogged that allows any spillage at the fill neck to accumlate just inside the fill neck area. If you have a diesel residue there you need to blow out that hose with compressed air to allow it to drain. Also feel around your generator filters and webasto filters looking for a diesel leak. If your filters have a dirty exterior and they are damp that is a good indication of stinking diesel. If filters or fuel line connections are damp or dripping - that is your problem. Let us know if we need to go further.
Good Luck.
Roger that!
2008 Liberty DS XL2
2023 Denali Ultimate
My 6th Prevost