If you don’t plan to make it a side business I’d stay with an ebay account. Starting bid of 1 USD/GBP/EUR and see where it ends. Though I’m not sure if there is a market for DIY “trash to treasure” terrain. There are just too many options out there. Paper Craft, plastic card, resin, plastic, MDF and the dreaded 3D ones and zeros files.  Again this would be a plus on ebay’s side. simple to set up and if it goes nowhere just delete it. If it takes off and you could make real money you can always start an etsy shop later.

I get that. The question I’m posing is: do you want to build and sell for fun (and possibly not make any money from it) or do you need to make “some” money to finance back the building or (third option) do you want to make a living from it? Then you would need to have some kind of margin on top of material costs and time invested.

I’ve included a couple of links that might be interesting. The first is Annie from Badsquiddo showing some junk to terrain she bought and the second is a link  to the etsy store.

I think the biggest problem will be getting enough people to find your terrain, although from what I understand your main goal is the build and getting the terrain to a good home.  I would go with whatever platform is easiest to use.  EBay might be better for sporadic sales.

I would also put your finished terrain projects into the OTT project system so at least some people can see and enjoy them. You might even win a golden button or be featured on the prestigious Unofficial Hobby Hangout on Twitch

Annie https://m.youtube.com/watch?v=roplrgUkgj4 and store https://www.etsy.com/uk/shop/Berlintuesday