Having read Dave W's excellent book I'm inclined to go for the sheet metal version of tool tray. I've seen the drawings of the stepped one discussed here and together with measurements made on my own 5 link Roadster have come up with this modified and slightly simpler version shown below as cardboard mockup.
Please ignore uneven rear flange which is purely due to card size limitations.
There is one less step in my design with two full width troughs, 100 x 40mm and 125 x 95mm deep. Assymmetry in diff housing and top link clearance.
Have just checked with rear on axle stands and fit and clearance is good. I'm guessing I won't need to provide other than vertical clearance (at least 60cm) with 5 link setup.
BTW if you have the factory 5 link system check the rear wiring loom where it passes close to the axle end mounting of offside (r/h) top link. The securing bolt has its threaded end sticking out beyond nut and close enough to trap the wiring loom on mine against the wooden inner wing due to poorly situated cable clips.
As the top link obviously moves in a vertical plane it had chaffed through the loom with copper showing on one of the individual cables! As all lights still working and as a temporary fix, covered damage with insulating tape and moved it upwards by re-locating two cable clips. Dealer will be advised but dissapointing on a new car
