The idea is that the rooms above are more functional and that communal living takes place in the central room. Or what are you getting at?
All standard floor plans designed for a family of four offer you that. I don’t see a common thread in the selections you picked from the internet: sometimes it’s a bungalow, then a city villa, and even a house with 5! bedrooms. Sometimes the open-plan space is L-shaped, then again not. The last one even has a second side entrance and a captain’s dormer. All of that costs extra. Basically, you always like “the same thing,” which every house has. But a house consists of more than just the “floor plan.”
I think you simply like the catalog price.
Your wish to manage with 280,000 requires some discipline.
Regarding your headline: first wait and see if and which plot you get at what price, and meanwhile talk to the house providers about what kind of house you get from them and at what price. Look for hidden costs in the construction services description from the house providers. P.s. Even Town & Country only includes earthworks up to 30 cm. For example, removal of soil is not included, only its storage on the property. Additional construction incidental costs will certainly be higher than 22,000.