Good point Mark
The plans I have seem very good & the info with them claims that the jack would be more than capable of lifting either end of a Roadster, as most Roadsters are approx 500 to 600kgs which is about the same as an F1 car (

),
How about I make mine up & post pics on this thread & see what you all think?
any input , positive or negative is welcomed.
I just thought its a handy

tool to have
cheers
andy