I still feel that heavy crossbow improvements and making a light cannon mobile are mutually exclusive.
If we're getting PLACs, we shouldn't bother throwing dice into a half measure.
Likewise, if we're getting arbalests, that means we can afford to invest more time into a heavier cannon.
Right, except, a PLACE by itself won't fully deal with the giant spiders. Having a backup weapon that can still hurt the creatures will make life a lot easier for our marines.
In the same way, arbalests alone probably won't cut it. They might hurt them, but it will take a lot of shots to take down a creature the size of a dinghy. Better to have the arbalests to hurt them and drive them back, and the cannon to finish the job.
As for why we should go for a PLACE rather than a PHACE...
Draignean said that the LAC is actually the equivalent of a saker. That's actually a respectable piece of artillery. Certainly capable of taking care of pretty much anything short of a tank on the ground. In fact, if we make it any bigger, it's going to become rather cumbersome to move around, significantly reducing its infantry-support role.
We don't currently have a HAC. I think we'd be better served designing that, before trying to make it mobile. If we have a HAC and a PLACE, making a PHACE should only require a revision... I think.
And we don't currently
need a HAC. Yeah, it'd be nice to have one for later, but we're trying to figure out how to save our marines in the Three Captains, not develop technology that we won't need for another six turns.
Madman, you won't be able to get the DIE past Draignean as a revision. What you want is the PLACE.
I also don't think your aethersilk bodysuit will work as a revision. I mean, you'll get it, but it won't have the properties you want. Remember, revisions are for minor changes to existing technology, not completely changing what they do. Draignean made it pretty clear in the core thread OP that sneaking new technology in as revisions is not going to work. So all it would do is slightly protect from aetheric weapons, except not because you are making it thinner. Make it a design. Or better yet, go with the HEM, which won't cost as much silk per squad.
Also, regarding strategy, what we revise/design depends on what strategy we are going for. If we are trying to hold onto the Unfinished, we need to design/revise with that in mind. So, do you think we should retreat or not?