This very battered Jagdpanzer Kanone arrived from a well-known online auction site a few weeks ago. It is the old Tamiya 1/48-ish scale motorised model and came to me lacking tracks, gun and one of it's roadwheels.
By sheer fluke I happened to have a gun/mantlet from another Kanone model in my spares box - left over, you may recall, from this conversion.
Tracks were fashioned from packing straps - cut to length and stapled - secured in place with dollops of PVA. The missing wheel (fourth from left in the photo above) was replaced by what I believe to be a T-34 wheel. It's round and of a similar size - job done!