Windscreens mirrors mounts?

[Talonmotorsport]

Now that I have my scuttle blank to play with I've been looking in to companies to make windscreens for me, turns out theres one not a million miles away that was approched by Caterham. They have done all the hard work not so long ago but where rejected on price but a right result never the less. For a reasonable price but not cheap they would be able to supply a fully kite marked and therefore an IVA approved sealed unit ready to fit.
What I'm currently looking in to is having the screen side mounts cast in either GRP or epoxy resin and having the mirror mounts incorporated in to them much like Westfield do. How ever this would mean that your choice of mirror would be limited by the mounting points.
I'm around 6-8 weeks from being able to make a working prototype but I'm hoping to be able to sell it as a complete kit that would just need a wiper mech. bolting straight on which I'm 80% sorted with.