Karl Streiger, on 01 July 2019 - 08:48 PM, said:
however no Mech nor combat vehicle will have spare volume for engine and movement train. because they are already designed to have only this size of enigine. yes you should have extra space for mounting a smaller engine, although i don't think the reactor core gets smaller, you need more bulk for power generation and heat sinks and fuel when the core produces more power.
but if you want to have extra space for smaller engines you should have not a single slot more over the "factory" build.
so the PPzc cicada would not have any space to mount a ppc unless its welded on top with independent power/ammunition supply.
IIRC, official variants like the PPC Cicada are in fact existing mechs that have been rebuilt by a faction more or less en masse to a common plan or mass produced redesigns made in a factory.
On the fly custom jobs are much rarer and often suffer from "quirks" that negatively impact performance due to the techs doing the modifications not being actual mech engineers.