....you could try JADAR-PART from Poland for the photo etch, If I remember correctly, they do a resin update (under the brand name ARMO) for the hull interior and turret as well as a fairly comprehensive engine compartment, both resin sets come with photo etch. Well worth looking for if you want to detail the RPM kit.
Modelcasten also do a set of injection moulded plastic tracks, I've found that the plastic is much more user friendly than the metal Fruil ones when it comes to fitting them to the fragile kit suspension units. If I've done it right, I've added the direct link to the Jadar site at the bottom of this post.
I hope this helps, Cant wait to see some images.