So many good questions, all of which we've taking into consideration already.
Especially the rent part is on point for us. In the price range we're looking at, we would pay less or the same, and in rare cases maybe a couple hundred more each month than we do in rent and that is including the so called 'cost of owning' aka mandatory insurance, waste disposal, etc. But without utilities, which we also pay separately now.
It is crazy to think that for the same amount of money we could get growing space. We won't set out to make it a business, unless you would call lowering our grocery budget a business😋 There are a lot of laws to get familiar with and we want to take it slowly.

Most regular houses on a 400-800m2 lot are more expensive than the places we are looking at. That's why we might as well go for a small amount of acreage if we want to buy a place.