birdbybird
I was going to link you here
convert to cabover, but I see it is your thread!
I have no feel for the bed convert, but as you imply, and according to Cheeze1's low trade quote, resale implications may be less important these days. I think a LOT of folks will be remodeling instead of reselling for a good while...plus it's fun!
I am reposting my TV conversion pics as they may give a better sense of space available.
30"x23" door

12" deep at top, 24: deep at bottom and still maybe 8" empty space behind that.

Mid shelf removed

The space for a bed should be ample by camparison with many overcab beds found in camper vans like the old Falcons and Great West conversions, as well as the pickup conversion Tiger CX.
Any pics of your dinette-dog kennel mod?