Only if the power requirements are low. Building such a thing in Traveller winds up being as big and cumbersome as a wheelchair, and less useful if it runs out of fuel...
Really? I think I could come up with something serviceable at TL15 out of MegaTrav.
Lessee:
Minimum volume for a fusion plant at TL 15 is 90 liters; I can get 135 kilowatts out of that. If I have this figured right, 10 liters of fuel will last me about 12 hours, which ought to be plenty for the typical day out. However, fusion plants are pricey, and pricey in MT translates to more control points, and unless I want to put a Model-0 computer on this thing, I want basic TL7 electronic controls and as few of them as possible.
So: fuel cells, or maybe batteries. Come to that later.
Minimum volume on a standard grav is 20 liters, and I can get a ton of thrust out of that - which is way more than I need, but it's only costing me about 100 kilowatts. I could also go with a TL12 low power L-grav, which only needs 3 liters volume and only draws a kilowatt, delivering 100 kg thrust - might need two of those. They're pricey though (see comment about control points).
So: one 20-liter 100Kw standard grav
And then I - umm - here it gets tricky. I'm technically in a grav well; I'm trying to reduce the influence of that gravity to make the occupant able to stand eye to eye with their peers despite paraplegia or muscle weakness. Do I use inertial compensators and set them to compensate for the planetary field? Or do I use artificial grav plates set above the person and pulling enough to neutralize some of the local gravity without having the guy fall on his head? They seem to have the same effect, and they're about the same volume, but the grav plates draw twice as much power - which is just wierd to me.
They're also sized by the volume they enclose, and I haven't established that. Hmmm - say it's got to get through a 28" doorway - most are larger, but there are some small ones. So, say the base is 70 cm on a side, height - typical interior door's about 6' 8", some are smaller, but we're aiming for him to be able to go shopping, not cruise through a 17th century New Mexico adobe structure. Let's try to keep height at 2 meters; if he's taller than about 185 cm (6 feet and a smidge), we'll have to come up with a tallboy model.
There's a person occupying some of that space; the upper body needs to be free, but we can snug the lower body so long as we do it comfortably - the rider is presumably either paraplegic or debilitated enough to need. Let's say roughly half of the lower meter is available for machinery: gives me about 240 liters for a control pedestal, fuel or batteries, we'll figure that out, and the rest needs to be in the base and top. We've also got about 15 cm headway - well, not so much cause this thing needs to float and he/she needs to not knock their heads on it, so let's say only 5 cm of that is available. Gives about an additional 24 liters.
So, a 2 meter by 70 cm square box, open at the top half so the occupant can see out and reach arms out, volume 0.98 cubic meters with 264 liters available for machinery - of which the less the better.
Grav plates need a bit under 10 liters and 49 kilowatts to serve the need; since we're so close, I'm going to assume the listed figure is the minimum size, one plate, though there is no listed minimum. So, we'll say it's 10 liters and needs 50 kilowatts. Inertial compensators would only need 20 kilowatts but are about the same size and mass.
So far, worst case, we're drawing about 150 kilowatts with a 20 liter grav module and a 10 liter grav plate.
Control's a bitch. Cheap and small makes it a TL7 electronic control, 100 liters buys me half a control point. If I use batteries, that's all I need, and I can load up whatever remaining machine space I have with batteries, 134 liters of batteries, enough to last me 6 hours at TL15 (and less at lower techs; the design's TL9 except for power). If I use fuel cells - it depends on whether or not I need control points for fuel cells. If I don't, no problem, but if I do, I need 2 control units at 200 liters, and I need to find a wee bit more room for fuel cells and fuel, so it won't fit a 28" door anymore, though it'll still fit a 30" door.
And then of course there's the hull itself, but MegaTrav's not subtracting the hull from the available volume.
Unless I've missed something, I can make a grav-assist "chair" work for about Cr16,500. Only thing really high tech about it is the power source. In fact, this puppy can hit 300 KPH at height and 40 KPH on the sidewalk.
