Get Ed to give you one of my Trenchguard bodies when they're cast. They were sculpted in line with GW guard plastics, and intentionally bulky.
Thing is though, GW plastics aren't 'GW plastics', the scale range varies on them too. Don't get too hung up on them being exact. I bought over £100 worth of plastic sprues last few months to do some scale research, conclusion: waste of time (and money).
My original Black praetorian body is great too, I'm working on some of them at the moment. They're slimmer than the Trenchguard and less 'heroic' scale.
Beware though, if you have a 'bare' torso when you come to sculpt equipment and clothes on it the putty needs to be a realistic thickness (half a mm for material) or the fatigues will look too big and silly. Ideally dollies are smaller than what a regular bare chest would look like to accommodate this.
Let me try and put together a scale photo or two of everything with some notes.
Yeah the current greatcoats are scaled to GW plastic guard, I'd used catachans for reference.
The Black Praetorian that was cast is perfect size though, slightly smaller so you have a mm or two on which to sculpt stuff. I'd originally written it off as being too fine, in my ignorance, and only now realise how useful it is!
As a rule of thumb though, the average GW torso width at the arms is between 8.5 and 10mm. This difference gets compensated out by moving the left arm, holding the gun barrel, up and down the rifle slightly. You only notice if the arms are holding one thing (halberd, rifle, two handed sword).
Things will never be exact with kitbashing, different mini's need different sized parts to emphasize their race or character. I'm assuming this is one of the reasons GW do 'heroic scale' stuff, it's easier to convert.
Forgeworld Death Korps arms look rubbish on Cadian torso's...
I've started work on some more heroic scaled stuff again and can see potential in this old idea of having lots of different designs done in a modular capacity: a bits library for building sci-fi troops.
It's either done through TFM or I'll do it via MOTN, either way I want it to happen.
Is there still a desire to see this through with TFM?
I've sent off about 8 different head style sprues and about as many rifles. Do you want to use them for TFM Ed? They'd be a pretty good starting point.
Working on these with the intention of casting for my own use but throwing them out here for discussion.
Had planned to rework the Trenchers after getting a few emails from people over the months asking to do more of them but decided I'd rather start again from scratch (except for the heads, I like them).
Casting these will let me do a fair number of heroic scale troopers. Intentionally leaving them fairly smooth to make sculpting over them easy but the boots and trousers could be left as is. Boots are intentionally clumpy, that's just my preference for heroic scale. They can always be filed down and/or sculpted over.