And the rules are now available.
From Wargame Vault, price £4 for a pdf
https://www.wargamevault.com/product/382341/Hell-in-Microcosm
And from Amazon, £9.50 in paperback, £4 on Kindle.

And a quick reference sheet for Hell in Microcosm
And for scenarios
Partisan Operations
Blocking A Pass
Bring up the Mecha
Holding the Line
In the beginning was the plan
In the beginning was the plan part two, the attackers.