With the new Robotech RPG Tactics coming out in a month how much would one have to shrink the Mayhem streets and buildings to get it to fit within the 40mm - 70mm scale?

According to their site its set at 1/285th scale, the miniatures are 40 - 70 mm. The average veritech battloid (which is most of what the set consists of aside the Zentradi battle pods) is 42.6ft tall and the average battle pod is 50 ft tall.

If you take WWG as being 25mm scale that equates to 1/72.
72/285 = .2526 so print WWG at 25.26% to reduce it to the Robotech scale.

If you take WWG as being 30mm scale that equates to 1/60.
60/285 = .2105 so print WWG at 21.05% to reduce it to the Robotech scale.