As well as the front end needle bearing mods, Neville was responsible for the deisgn of the de-dion rear axle, original being the live axle Jeremy Philips design.
The first few Sylva Stylus cars were Stylus bodies on Fury chassis, so they are somewhat different underneath.
Rob was being kind earlier, so I'll say what he didn't !. (edit... Beat me to it Andy
)
The reason Neville Powell chassis are "better" is that Nev made the original SSC Stylus chassis jig & the early chassis, which are fully welded.
When the guy up north took it on, the jig was cut in half to transport, with pins fitted for alignment.
The jig was not properly reconstructed & the chassis made there are stitch welded & allegedly not always "true".
This is mainly in differences between wheelbase on each side of the car, & includes Rob & my chassis.
Original bodies were made by Sylva in clear gel, SSC (P.Powell) had them made by Southern compoites at Lasham in white gel(a aero glider manufacturer/assembler). I collected my body from there circa 2000.
When Peter moved to Wales he shifted GRP production to somewhere in S.Wales I think (or was that just the hardtop concept Rob ??), then later moved again to its current manufacture at Darrian.
When Tim took on SSC he took chassis production in-house on a new jig & revised the chassis again to incorporate all the mods that builders had been nagging P.Powell for such as adjustable front suspension mountings, radiator mountings, steering rack mount, floor mounted pedals, one piece doors, decent door hinges, etc.
Later Tim & Chris (now at Aston Martin) created the current fully independant rear end, through 3d modelling & analysis.
A Jaguar chassis designer checked the design & gave it the thumbs up, I seem to remember he bought a chassis too.
Before losing his way, Tim was making a concerted effort to simplify assembly & up the build quality by standardising on 4-cylinder engines (usually Ford) & offering good value assembly packs.
But personal circumstances & the kit market died under him......
Development wise a new chassis & body (if you can get one) is far superior than the earlier ones.
Unfortunately time has passed & the SSC brand has been damaged rather than enhanced, but it may be back one day.