I'm sure there are many answers depending on how you spec it, but based on buying, cutting and welding yourself, what sort of money does it cost to build a Haynes roadster chassis?

I have no option to drive for most of 2016 and aside from a 205 GTI project I have some time spare to build another car so am looking at cost options.

Assuming you have already have a hacksaw, grinder, welder then tube materials are £90-120 for 25x25x1.5mm and 20x20x1.5mm ERW with or with out the delivery, buy a 150x3mm flat and go scrap bin raiding for the 50x5mm flat, buy the suspension brackets don't bother making them.
Basic chassis including a steel floor should not be more than £300-350.

[Edited on 4/1/16 by Talon Motorsport]

I have tools to cut and shape and a welder and a local steel stockist to help.

Useful info - thanks!

Negotiate the steel based on weight if you can.

i bought the chassis as a flat pack kit costing £350 so to buy the raw steel and cut yourself should e a chunk less, plus steel is cheaper now than last march

Are these prices still about right for the chassis steel. £300-350 as above or has the steel price changed much. Also, building a chassis or using a flat pack kit is there much tolerance in the joints? (i.e. if there is a small gap between the steel before welding is there any issues with bodywork etc.)

Prices pretty much the same.

If I was going to build from scratch it would be a midlana, easier engine install etc, unfortunately there are no flat pack for that available afaik.