I will be re-basing my 15mm Renaissance forces for Basic Impetus using 25mm basing guidelines. The game has very short movement rates for standard 15mm -- fine for space-constrained Europeans, but here in the empty expanse of Canada big tables are easier to find. Doubling distances will work well on a six by four foot table.
This gives a rough idea of what a pike square will look like on that basing - each base will be 120mm front by 60mm deep (that can be varied, but I think that depth will work well); a pike square then consists of a front and rear base, only separated as the casualties wear away at the rear base.
I can only wonder what the result would look like in 10mm. I won't duplicate my Italian Wars army but it is tempting to look at another ancient or medieval period with a small-scale force on very big bases.