This will mostly be a compilation of resources/comparisons
I ended up going with the 30m² 3×10m Tor greenhouse from Grohus. 6mm polycarbonate. https://web.archive.org/web/20190504134729/http://grohus.se:80/produkt/vaxthus/extra-starka-vaxthus/tor-300
Took a lot of work to get it set up, and some of the design choices are a bit weird, such as the doors, not a fan of the doors.
It came in ~1m sections that had to be bolted together.
Door and roof height was a bit low, but we mounted it on top of a frame of two stacked 2×6“.
I've built tall raised beds, one in each corner (~4×1×0.3m), and filled them with a compost-sand mixture.
Watering is mainly done with soaker-hoses buried beneath the soil surface.