I built a multipurpose Del Sol race car. This car is a compromise. It is pretty much IT legal (install few bits). It has a FIA rated cage (built by me) and is also legal for Targa Newfoundland Rally. It has 500/700 rating with stock front bar & a 19mm rear bar. It handles well and is well suited for Targa. Caging a Del Sol is difficult to do right. I studied it for quite a while before fabrication. IMO, its best to bend 1 complete front hoop and attach it to the rear hoop. Below are some pics.
http://users.eastlink.ca/~mcnuttracing/del0.jpg
http://users.eastlink.ca/~mcnuttracing/del1.jpg
http://users.eastlink.ca/~mcnuttracing/del2.jpg
http://users.eastlink.ca/~mcnuttracing/del3.jpg
http://users.eastlink.ca/~mcnuttracing/del4.jpg
http://users.eastlink.ca/~mcnuttracing/del5.jpg
http://users.eastlink.ca/~mcnuttracing/del6.jpg
http://users.eastlink.ca/~mcnuttracing/del7.jpg
http://users.eastlink.ca/~mcnuttracing/del8.jpg
http://users.eastlink.ca/~mcnuttracing/del9.jpg
http://users.eastlink.ca/~mcnuttracing/del10.jpg
http://users.eastlink.ca/~mcnuttracing/del11.jpg