I'd like to replace them with thinner MDF bases that are less obtrusive, but would like to keep the footprint the same.

14 minutes ago, Chucknuckle said:

I'd like to replace them with thinner MDF bases that are less obtrusive, but would like to keep the footprint the same.

Infantry are 27mm, but you'll want to get examples of the vehicle bases so you can get the right footprint complete with movement notches.

cheers