http://www.locostbuilders.co.uk/forum/2/viewthread.php?tid=127272
Its clear in the blue book you are allowed 1 bend in the front loop (or lateral bars if constructed in that way) as per this guidance in the blue book.
8. The front leg of a front or lateral rollbar must be
straight, or if this is not possible, must follow the
windscreen pillars and have only one bend with its
lower vertical part. Where the main rollbar forms the
rear legs of a lateral rollbar (see illustration Appendix 2,
drawing 6), the connection to the lateral rollbar must be
at roof level.
IMO, as there is no reason why they cant be straight on a 7 type car (no dash or pillars to get in the way really) so having them straight would be the easiest way to ensure compliance.
As for the connecting bars:
Diagram 53 (below) in the book shows that they can be bent but does not mention as to what extent:
Rescued attachment RollcageMSA.jpg
Matt (procomps) (or resident cage expert?) general view is that the cages should be built exactly as the diagrams, with little or no deviation. Im of the opinion (baring in mind I have little/no racing or scrutineering experience!) that if the drawing states they can be straight or bent and doesnt state by how much or how little, then you have a fairly reasonable argument that as long as you dont take the piss, they will comply. The items you pictutred look to be pretty much as the diagram and therefore should comply with no problems.
[Edited on 9/12/10 by loggyboy]