i'll have a closer look at the plumbing on the servos but i'm sure they are just for brakes. 1107 has a similar set up though the servos look just slightly different.
the car is all MK3. the rear clip was modified to accommodate the wider rear wheels fitted in the 70's. iv'e got the clip turned upside down and completly stripped of anything that'll unbolt at the moment. it's plain to see where the fibreglass has been added for the flares and cut away for the exhaust.
there are quite a few subtle differences between 1103 and 1107 but 1107 does have a lot of the same problems as 1103, for example, where the catches are attached to the sills for the rear clip the sill has split the same making the catches wobbly.
i'l take more pictures in the next couple of weeks