I want a Tank Mark II in 1/72 scale because a 1/76 tank model looks wrong with most of today's figures (the old, small, Airfix figures might look OK, but HaT's figures are proper 1/72 and they make the Airfix kit look small), so I'm doing a mash-up of the Emhar and Airfix kits. I used the cab from Airfix and the body from Emhar, with sponsons from either Airfix or Matador.
Progress so far...
Doesn't seem to matter that the Airfix is 1/76 and the Emhar is 1/72:
After some filling, I painted the cab to show up any defects. I can still see some, but I can live with it!
Since the above photo was taken, I have slimmed down the towing shackle in preparation for correcting it.
Trying to make a stowage box at the rear out of some bent up plastic strip. Then I realised I could use a part of the Emhar kit (the petrol tank) if I put it on upside down.
As you can see, the sides are on, and there are some big gaps! I'm not at all worried about the gaps because I will fix them when I fit the tracks - I haven't strongly attached the sides of the tank because I know from experience that this kit is hard to get perfect if you follow their instructions. By leaving the sides only loosely fitted (with very little glue) I can jiggle them about as the tracks go on, to make the whole thing look OK-ish.
I've also hacked off a line of rivets and one of the small hatches in the rear roof and will be removing the other one. These hatches that Emhar have added are only present on the Bovington Mark IV and did not exist on the real Mark II tanks, and the fictitious line of rivets is a fashion trend that Airfix started back in the 1960s!