I have the DML Hybrid kit, and it is nice. But there are problems.
First, the turret has shape issues. The rear bustle is too long and the rotor shield/mantlet sits too high. Mike Canaday has fixes for this, and a search here or at Missing Links will turn up threads with lings to his web site for the fixes. I'm too inept to figure out how to post the link here. Another option is to purchase CMD's absolutely SUPERB resin turret with aluminum barrel and resin muzzle brake.
Second, the main gun is too long. Using the CMD turret set fixes ths, as does using a Jordi Rubio or Eduard barrel. I have the Rubio; it is very nice and the only downside is it has the rare, early squared-off holes in the muzzle brake. Those barrels are more appropriate for an early Firefly Vc or M10 17-pdr (Achilles) than for a very late Firefly IHc.
Also: the kit mentioned has parts for a Pacific Theater flamethrower including a nice late, high-bustle turret with oval loader's hatch. This has some dimensional corrections over the standard Firefly turret, but the mantlet still looks to me to sit too high. Anyway some very late Firefly IHc tanks had this high-bustle turret so the kit gives you that option without specifically telling you so.
I can also recommend stuff from Accurate Armour. I like their resin tracks, and the British Stowage set has lots of useful stuff like camo nets, ammunition crates, etc. Their M4 British Update set is for the Tamiya kit but the parts would be applicable to this one, too. Also, AA make some 17-pdr ammunition should you choose to do a re-arming dio or build an interior. HTH,
Greg