Given your medical need for long showers you also need to be looking at the size of the water heater. I hope you and your wife don't like to shower at the same time of day--one morning and one evening would help with the heating of the water.
I like Glenn's idea of laying angle iron outboard on the frame rails and welding crossmembers to that. The body on my truck is built "converntionally" with C-channel running longijit...longatoot... the same direction as the frame rails, with X members on top then checker plate deck. The deck gets fairly high made this way. It is 48" to the deck from the ground. It has steel skirts, tool boxes, about a 20000lbs tongue load rear reciever .
I'd post a picture but I can't because the forum software doesn't allow iPhone picture size/format by .1 of a mb or something and/or I don't know how.
iPhones are rare these days anyways...
The rear wheel openings are lined with stock off the shelf stainless steel fenders. It looks like Semi-Sane might have the same?
Glenn's way will keep the deck height lower. You can add strength with deeper sills on the outside or side skirts that have deeper dimension to them.
A smart-mobile won't fall through the deck.
You could copy Semi-Sane's body work dimensions and have a fab shop cut out the plate parts for you to weld up. Use as much stock off the shelf fenders and trim and tool box doors as possible...
One thing about building with mild steel you can change stuff, put holes to hook your ramps on, places to store them, etc.
If you travel off highway much I would think about mounting your deck with the spring style body mounts used for box vans etc at least at the front so the truck frame can twist like it is made to without putting the torsion 100% into your bed. The bed can be made lighter and simpler if it doesn't have to try to hold the truck frame straight.
Build the bed using the truck for the jig... but always keep the "view from the bottom" in mind for access for maintenance and repair...
Be careful welding in the rain they say...
Apparently the new Winegard ConnecT 2.0 will be available mid January. I currently have the At&t Unite Explorer for unlimited Data and I have ordered the factory WIFI extender offered by Integra. I am trying to get a head start and decide what my communication arsenal will look like.
Option 1: I purchase a cellular repeater/amplifier such as the weboost Drive 4G-X RV and switch back and forth between cellular and WiFi as signal strengths dictate.
Option 2: I wait and purchase the Winegard ConnecT 2.0 so that I have a single connection point for all my devices (2 phones, 2 iPads, tv’s.
Any input on these options or others would be greatly appreciated.