I think the real question is, "Is it sellable at all if it isn't textured and posable?" I think you've hit on a good vein of gold because the sets and props are a pretty untapped genera. But check the competition. Like Joe's Diner. I think you'd need at least to make the oven and the top shelves near the range openable then the faucet to push down or up. Also I would go with an electic range, because it is easier to make a glowing red then to have good blue gas jet flames. Extra points would be to have the kitchen in a "set" with a central island and a place for pantry and fridge. And a bar with stools. Also missing in many sets is good lighting. Check out Joe's Diner in the store. It is $30 or $35 and I bought it because it's complete. If I have to do the work you're talking about I'd just get a freebie from virtual interiors and texture it and make it posable. I don't think I'd pay for just the geometry. Hope this helps. :)