I was at Mick's on Friday going over future projects,I suspect such a project would be well down the list.( but not impossible ).
That said the rhomboid tanks are a piece of cake and ideal for scratch building from cereal packet card.( to the point I've even a half finished mk1 with a full interior floating around here some where,I've no interest in doing these tanks as a resin kit as there's so many on the market,but if Simon and Mick asked for them it's more than possible to build ((for example))a mk4 male and female,and have them moulded in a week.there that easy)
However if enough people nag I'll do a tutorial for rhomboid tanks
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Mark.