Originally Posted by MartinClan
Have you considered making the "bulge" in aluminium. I can tell you, from experience :-), it is pretty easy with just basic tools. I have plenty of offcuts if you want to try!
to be honest, no I hadn't thought of using aluminium. The bulge doesn't need to be very pretty as it will be covered in carpet but, I'll bear it in mind if it doesn't work out with the GRP.