this is a (quick) 3d image i made to have an idea of how the stands are going to look like, and for me and my dad to see the sizes (note that these must be divided by 10 on the picture) and to already give you guys an idea, and maybe some suggestions for me...

(speakers were done really undetailed, sorry for that)
and there are supposed to come spikes under the stands, maybe under the speakers too, the center 'tube' is going to be filled with sand to make the stands heavier.