More questions from me

. Basically I am fitting a 1.4 K series and all associated bits to my saloon (long term project to spread out the cost) with the intention of doing some track stuff and also some touring accross europe

. My girlfriend wants to join me on both but is worried about the safety (as am I) if hit or crashing on the track ect and wants me to fit a cage, which is perfectly reasonable but we all know it isn't that easy. I'm not sure to go for a full cage or just a hoop? There doesn't seem to be anyone producing these off the shelf and I'm worried about building one myself as it will need to conform to certain regs. Long story short, does anyone know who makes them, or has someone got one, or am I stupid for looking? Thanks in advance
Ben