I made a simple base where you put two two by fours 545 mm apart and four studs spaced 450 mm apart on both ends. Idea is to have space for two hives and enough space in between the hives to be able to put hive parts there while doing maintenance.
This makes the base about 2 meters long. Since the base is same size as a hive box and the base for hive box is a bit larger than that I had to put some planks on top of my base that were about 570 mm long and put the hive on top of that.
Overall this base works just the way I wanted it to, there is four 200x200x200 mm cinder blocks under the base corners and I have plenty of air space under my hives as it is now.