I have been putting my Mark IIb Land Raider together.
The track units went together very easily, adding the resin pieces was a little more complex.
The problem was that the resin pieces had shrunk slightly which meant the fit was not as good as the other plastic parts leaving some gaps between the resin parts and the plastic track units.
I did think about filling the gaps with green stuff, or using plasticard, however for the moment I am leaving as the gap is not that big.