Welcome to the forum!
That’s a very interesting variant! I look forward to seeing how it turns out. Looks good so far! 
PS, don’t forget to hit the “Going” button at the very top of this thread. You may have already done this, but either way I figured I’d let you know.
Your handmade hinges are perfect. However I might suggest taking an X-acto and scraping off the mold lies on the barrel brace.
Lines are actually already off. That is just where the line was … it left like a ghost line after I had scraped it away 
Is it glued in that forward-leaning position? Because it seems to be leaning a bit far forward compared to how far it could go IRL.
Its in that position for a reason. It will become obvious as to why once you see the completed build.
Waiting with bated breath, then 
am not joining the campaign as this was started without me seeing it was running (been off the site for a few years but back)… this is where I am with the RFM Firefly:
the next steps will be some light weathering and then going to put aload of sare track armour on it…
Keep in mind folks of the gasoline-powered motor that rotates the turret and the exhaust pipe that runs under back of the last one third of the left side of hull, from that motor. I’ll show the pics once again:
Nice. The tones you have got with the OD look really nice as well
thanks - this is MiG Ammo SCC 15 green rather than straight OD. Most of it will get covered with tracks (which just means I need another late war Brit vehicle to have it only in green…)
Was that on all shermans ?
british Fireflys for sure…
Both Ic and Vc?
Was is not just on later Shermans that they had the small pony motor to keep things going in the tank without having to run the main engine?
Can someone knowledgable on the subject please weight in here? I for one would like to know more about this.
The small exhaust pipe, you mean? It was there on all Shermans, but the pipe was not of round cross-section like the model photos above show it. Rather, it was more a flattened tube with elliptical cross-section. Asuka, Meng and RFM kits include it, perhaps others too, but the old Tamiya and Italeri kits don’t.
All M4s had that, inherited from the M3 in fact 
I’ve got TM 9-731A for the M4 and M4A1, dated 14 November 1942, and it includes a chapter (XXIII) on the auxiliary generator.
All Shermans. However, the M50/M51 is the exception in that the exhaust tube came out above the left fender, above the last bogie.
Photos show flat and just a few rounded exhaust tube. I choose to model a round one years ago.
For your interpretation:
Might this small generator and exhaust also be present on M10s and Jacksons ???
M10s and whats? Oh, I suppose you mean M36s.
Not on the M10. I don’t have a TM for the M36 (and don’t feel like trying to locate a scan right now), but the TM 9-752 for the M10 has no mention at all of an auxiliary generator — the only generators mentioned in the chapter about the vehicle electrics, are on the flywheel side of the engines.
