I run a Blitz2 as my daily driver, in ALL weathers, yes I have waterproofs, but am currently mid-way through fitting a heater, using a matrix from a Renault 25 estate, fitted into a homemade sheet steel heater 'box'. For a blower motor, I'm using 2x 120mm electrical equipment fans, each capable of shifting 165 cubic metres of air every 30secs, so they should blow quite well, as for ducting: to my windscreen demister nozzles, I have used 1 1/2" bore rubber hoover-tube type hose, and plastic plumbing fittings for cabin vents, ...and it's all coming together very well.....pictures soon to follow.