I’m going through a similar problem getting our door repaired/replaced.
Lippert is not the answer for everyone. Even FR can’t get us a direct replacement because our rig is 8 years old. They’re not sure who made ours....they didn’t recognize the only label we could even find. We supplied the VIN number and we’re still nowhere.
If we could get the exact parts needed, it truly is a DIY job. Only thing.....until you have the replacement parts ready to go....you can’t close up shop.
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Ken and Terry
2018 Sunseeker 2430S-CD, nicely modified and carried by a 2017 Ford E450 Sport
Former Georgetown 330TS owner for 10 years with more mods than I can count, pushed by our 2017 GMC Terrain