Japanese bunkers

I was looking at Big Lee's blog the other day and he'd produced a magnificent bunker (I think in 28mm but I could be wrong).  Which has provided me with some inspiration!

In preparation for Tarawa I'm now turning some of my energies to building some Japanese bunkers for Spearhead.  But these will be ickle 6mm beasties and based mainly on just 1" square bases (though I may try some of the bigger complexes on 2" x 1" bases).

Some inspiration will be gained from the attached photos.  I'm using a mixture of matchsticks, cocktail sticks and DAS modelling clay.  As they come out I'll post up a few pics.