After a patient wait my tool tray was finally finished last weekend, built very ridgidly in 2mm aluminium and specifically for latest Roadster with 5 link rear suspension.

Local fabricator had underestimated work involved which came as no surprise. He is willing to make more but price will be £220.
Dropped straight into tool tray hole but needed a little tidying of support lips for neater fit. Then spent a while underneath car with suspension loaded to check for clearances - all looked good allowing plenty of suspension movement. I had spec'd on drawing a tolerance of 0 to -2mm for external dimensions and these had generally been adhered to.
Had intended to paint underneath but this task has snowballed into full prep, two coats of etching primer and further two of
Hammerite, black underneath and red on top as tools will be easier to see - its also colour of car

It will be finished with thin neoprene seal on lips. Will also consider some rubber support pads on top edge of fuel tank if I'm tempted to fully load the tray.
Trial run suggests that jack and handle, MG style pressed steel spinner removal tool recently purchased, and my comprehensive tool roll with full range of spanners, will all fit in lower section.
Will post photo's when fully fitted.