Very nice work! Great to see the progress and myriad issues with filler etc, a common frustration I'm sure. One tip I found was using a little bit of thinner mixed into putty (old humbrol tube) meaning you can apply it much finer. Fully agree on the hidden detail aspect, I sometimes look at the minute detail just before gluing it closed and think you're an idiot Patras, but then whenever I look at the model it makes me smile inside

Happy modelling all!