Geeeze, Mike! Make it easy for me, why don't ya ...

...

...? I've had that one figured out for a week or so, ever since I saw that plan for the cheap'n'easy Vardo somebody posted a link to, here, somewhere.
I'd build that Vardo, but you know me ... I'd have to tweak it considerably! Instead of fabric or poly-tarp for the top & sides, I'd use 1/4" ship-lap planking after I gave it a bit of a whisky/wine barrel bulge to the middle. I'd also round the front, kind of bullet-like (but not
too pronounced), and extend the sides down to the trailer frame for some outside-accessible storage.
I'd leave the back pretty much the way it's designed, except maybe offset the door to one side a bit to make room for a potty closet on one side. I'd also make a fold-down aluminum-grate patio/deck that form-fit to the rear bulkhead in the UP position and would have a door built into it to access the trailer while on the road.
Inside I'd have the aformentioned potty closet, and then a basic counter with sink and a stove-top, maybe an ice-box, down one side. The other side would have the dinette/bed ... very similar to a slide-in truck camper.
With the solid sheathing/roof, I could make provision for and position a couple of windows in the sides and let the sheathing extend over the tops a bit like an eyebrow or eave (and since I've got a few of those Australian CAMEC radius-corner crank-out windows laying around, I'd more-than-likely use those ... but normal crank-outs would be fine, too).
I might have to contract out to Roly to have some wooden-spoke wheel-covers made so I could paint 'em up gypsy-style, and maybe even turn him loose on some gingerbread outside trim.
Since I don't play with CAD, Paint, or PhotoSop, and I don't have time to sketch this thing out (it's all in the
mind, ya know!), I can't post any images for you to drool over, and you'll just have to use your fervent imaginations!
No way I could have it done by November (hell, I'll be gone for 60+ days this summer, and paying customers' work
always comes first!), so I guess I loose points there. And since the trailer wouldn't need fenders, well ... thanks anyway ...

...

...
So, there you have it ... what
I'd do with a Harbor Freight frame if I won one! NOT what you expected, was it ...

...

...?
You know where to ship that frame, right, Mike ...

...

...
CHEERS!
Grant