Kevin, due to my particular 'all-wood' theme, including the galley, I decided that I didn't want to have bacon grease all over my cabinet doors, so I didn't install a stove and do my cooking on the table with my coleman propane stove. We also do all we can to keep water out of the galley, due to future dry rot problems, so I wash my dishes in a dish pan also on the table. No water tank, pump or drains involved.
I have always felt, for my needs, a cork-lined "quick-melt" sheetmetal ice box installed in the galley area would waste a lot of space. I know that an extreme cooler is better and can keep ice frozen for days and can be carried in the tow vehicle.
So, to answer your question, I have 4 storage areas within my galley, one is for bulky stuff within deep cabinets and silverware drawers, all located below the galley counter. The next area is a row of 3 drawers just above the counter and above them are 3 storage cabinets for canned goods and plates and such. Lastly, an upper shelf with a front retaining barrier for condiments and small stuff within easy reach when cooking. I felt no need for added support at my hatch supports. I looked at dozens of pics of existing galleys, and this design works well for me.
As far as the inside goes, I knew I wanted dome lights, and individual reading lights above the pillows. A 12 volt outlet and a couple of 110 volt outlets were added for mattress heating pads, a small electric heater and perhaps a clip-on 110volt light to save battery power. I added exterior lights above both doors as well.
I knew nothing about interior storage needs, but built shelves for small stuff that fold up, at each side of he pillows, and a long one near the ceiling. I have an unusual wall to wall, 3 doored, 3 shelved storage cabinet above our legs, which folds down flat against the front wall. Then whenever it's raining we can have the the neighbors over to share our prime rib dinner, while 4 of us sit with all 8 of our feet in the foot well and relax with our elbows on the sliding table, that flips up from the footwell cover, all within our 4 x 8 woody.
I won't go into detail about the AC unit located within the tongue box which blows cool air up along the ceiling from above the pillows. I hope this answers some of your questions about the needs of a teardropper, and I am sure there are a whole bunch of more 'stuff' that you can incorperate into your build. We all think differently so it's up to you to make it as original as you want. (flip-down TV, sound system, etc.)
Roly, sorry about being so long winded, but just got on a roll. (actually, I've been "Rollin" all my life).