You'll find many interior panels in the storage compartments thrown in to hide pipes and wires, often at odd angles. You can remove them and square them off inside the cabinet as to gain more storage room.
A lot of the outer appearance panels are held in on the back with staples. When you find an unused open space behind the panel, you can gently pound the panel back into that area, saving it for other uses. I opened up the space below my cooktop above the gas heater, much space under the sink, and quite a bit of space in the overhead cabinets by the radio. I also opened up the space above the radio. I put various sized plastic trays in those places. My door is opposite a dining bench. You may have a door there under the bench. I didn't so I popped that panel out, built a frame and moved the panel back halfway under the bench. Still retained some underbench storage and have a cubby to throw shoes into. Shoe storage is usually a problem, especially in smaller RVs.
I swear by the Extend-a-Shower curtain rod and Oxygenics shower head to making RV showering bearable.
2019 Cherokee Wolf Pup 16BHS flipped axle
2019 Ford F-150 S-Crew 5.5 bed V8 w/tow package, ITBC, Tow Mirrors, 3.55, 7000# GVWR, 1990#CC
Husky Centerline TS WDH 400-600# spring bars, SumoSprings