Carried on with the chassis blasting today in my Dexter tent. Once I'd finished the top a quick flip with the block'n'tackle revealed the underside which looks to be in pretty good condition. There are a few repairs but these appear to be of a far higher standard than the tacked on tinplate on the outriggers.
The front of the chassis turned out to be like new under the thick coating of engine oil and dirt and blasting the underside took only half the time of the top surfaces.
Last job of the day was to give the good bits of the chassis a once over with red hammerite (not much point in painting the bits I'm going to replace), chosen because it was on special at half price, only a tenner a litre at Halfords. Methinks it's starting to look not half bad.
Back to work tomorrow so plenty of time for the paint to dry before any further progress.