the 2 companies that you have asked about are very good companies.shell valley has been around for ever and ffr's are literally all over the place.i was in the same situation as you a few months ago.if you have not done so yet you should take the time to check out B&B manufacturing.I went with B&B after speaking with the fellows they have great quality glass and the car fits very well.it is a least worth your time to check them out.the big thing to remember about these cars is they can look as good as YOU are willing to make them.here is a link to my b&b if you are interested
http://albums.photopoint.com/j/Album...9127&a=8521463
enjoy john b