The main problem is the INF SCP modpack is very old, based on 3.5.5 code and effects. Some of the stuff used in INFA is far more optimised and modern than the versions used in the main INF mod.
There's also the problem that Sid was working with an old modpack when he vanished for a while, and me and Qwer continued working on another one, so there's two versions of the INF mod which have different weapons, balances and bug fixes. This is what I think will cause the delay once Rampage is done with the missions.
We also have some new interesting models to complete and other HTL ships to make. This is going slowly as I have to use TS and Max on my laptop now, and it's not as easy to work with as my old desktop system.
At the moment I'm currently working on these models and others for INFA as well.
This is my current WIP:
Uh ignore the fact it's the first mission of FS1