Thanks for the comments guys, I got a little bit more done over the weekend

I added some structure to the turret base with plastic card

and then wrapped some thinner plastic card around to create the final shape

I'm really pleased that it actually came out looking like the real thing!

After that I started adding some of the top hull detail including the grille, rear hatch, bolt details and weld seams around the turret mount

Still some more work to do on the welds and some more detailing but it's getting there

Hopefully I'll be adding some wheels and the tracks soon and I'll see if the tracks will fit together!

Thanks for looking