3 years ago I found an Avanti to replace my dometic and width was correct and height was 1.5 shorter so put 2x2 pieeces in and small grill from ACE and trim and on the back side I just blocked off the vents in the rear panel and left the roof vent in place and filter with fiberglass furnace filter to keep critteers out and it works out fine and my Yamaha 1kw gen will run it going down the road from the pickup box on about a cup of fuel a day. I drilled a couple of 3/32 holes in the top /inside of the handles and use small bungies to a cup hook on the left side cabinet to hold the doors. Works great and no issues in 3 years or so!!
gtwitch in wyoming