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SRE
Yup, unfortunately you're a million miles out. Your kit prices are wrong, sales prices are wrong and even if you got those right there's very few customers about at the minute and those with upwards of 70/80 installations are just about getting by at the minute, most on the strength of their quality of work and recommendations. Given that - even if you could get the prices right you won't have the luxury of finding the first few sympathetic customers who let you take 3 days to install for your first few.Or have I got this completely wrong!!!
The boat was missed in October/November. It's been a rollercoaster ride since oct which is great if you like that sort of thing - I don't :-(
Have a look round there's loads of other opportunities, visit a few trade fairs and see what's really new to the market.