Thanks!!
A little more progress. I didn't like the tanks that came with the conversion, so here's my attempt at fabricating new ones.
You can see here the resin tanks compared to the ones I made:
IMG_6389 by Brian Smith, on Flickr
IMG_6388 by Brian Smith, on Flickr
I also have installed the floor pan to the chassis:
IMG_6390 by Brian Smith, on Flickr
IMG_6391 by Brian Smith, on Flickr