Nice to meet you.
Slide outs can be a bit tricky, and they add weight.
I did the engineering design for this particular slide out, the kitchen slideout on the 1996 Holiday Rambler Diesel Endeavor LE.
One important challenge is thinking through how the camper works with the slideout closed.
I doubt the cabin of a teardrop would be usable at all with the slideout closed.
For this motorhome we had only about 2 ft of dirty exterior wall inside the coach when it was closed, and we hid it cleverly against other interior walls - one dividing the kitchen from the bath, the other a little dividing wall right behind the driver seat that was there only to hide the dirty side of the slideout wall. You can do those kind of things in a 36 foot motorhome, but I don't see how in a TD.
You would likely be committed to only getting inside if you open the slideout.
Seals get pretty elaborate all around a slideout. And leaves and sticks fall onto the top of the slideout, which tear the seals and jamb it up when you close it. Notice the little awning that covers the slideout just to keep the debris off that little roof. You also need a secure latch to keep it from opening during travel. In this motorhome the electric drive for the slideout was a cogwheel engaging holes drilled into steel square tubes and you could not back-drive the gear motor.
The design and build of the slideout would probably take more time and money than the design and build of an entire traditional TD.
But never say never - I hope you pull it off and show us how you did it.
There is that one TD made in Australia called the Gidget, shown below. I've never seen in an interior photo of it with the slide closed, so I don't know how you get into the cabin with the slide closed.
It will obviously block the entry door - perhaps those big windows line up and you somehow crawl through them.