The space needed is Not that Bad, I also only have a small table and no dedicated room

I am making two 5 mm foamboards each with a size of 80cm x80cm, these are devided into 40mm squares, giving me 400 squares per board, more than enough space for atleast 10 buildings plus roads. Most buildings will be 6x5 or 9x7 squares.
And if my plans work out I can lay them flat due to using magnets!! (still in wip Phase).
If not One Box will Hold them all.
In this scale I can still fit about 80-100 Zombies on the board, and instead of 20 vehicles I can still use 5-7 plus odds and ends.
Of course you can't go for Mega hordes in this scale, but it looks quite impresive, and with my old eyes I can see them better

Cheers