ADB said they are planning to release smaller 1/7000 scale ships. That will put the Constitution-class at about 41 mm or just under 1-5/8 inch long. It looks like it'll be six ships on a spur. The ships will be fixed/attached to their bases because they'd be too small to put a peg-hole in them. Steve said he wants to do at least two sets for each empire, one with ships you only need one or two of (e.g., dreadnought, tug, etc), and another with ships you need lots of (e.g., light cruisers, destroyers, and frigates). No idea on the price yet. Gunboats run about $12 - $15 per set, but they don't have built-in stands.
DISCLAIMER: I do not work for ADB and do not speak for them.