Full roll cages for roadster

[Talonmotorsport]

I've been thinking about supplying full rollcages for a while but as with the rest of the roadster it's going to be one of those personal taste things. I build Autograss cages and space frames so I know where the mounting points need to be and how to spread the load with mounting plates.
Would you want an internal cage that can either be bolted in as a retrofit or fully welded in mid build? One advantage of bolting it in would be you could remove it if need be. I'm not talking FIA/MSA spec cage if it was bolted in but some thing is better than nothing espesh if you want to do track days once in awhile.
The other option would be an external cage but that would probably be best fitted mid build as it may cause problems if you have fitted your side panels.This option will require mounting plates to be welded to the chassis as the forces will be pulling down on the upright tubes rather than pushing on the bottom rails and floor.
Before every one jumps in and says that 'they will pay more for safety' how many will YOU be buying? So you can start the ERW thickness Vs CDS safty arguement, I will be offering both options so you can make your own mind up on where you want to spend your money.
Tubing will be either be 42x2.5 or 48x2.5 CDS or ERW machine profile cut suitable for TIG welding if you so wish.
These cages will be for road use only but with motor sport in mind, they will not be FIA/MSA compliant how ever they will not be flimsy add on 'roof racks'.
Any thoughts and opinions welcomed, I'll post some pics of the product when I've got round to putting some bends in it.