I made some more progress today:-

I made a carbon Ackerman plate, unfortunately I went slightly overboard with the sanding, but as I'm using the other holes anyway I will use this one rather than remaking it, and may sand the unused second holes off completely to save further weight.

I cut out parts for a new battery tray that is not only much lighter but will lower the CoG too, as the alloy tray I have at the moment is raised off the chassis on spacers by about 5mm to clear the mudguards, I will mill groves in the chassis to hold it in position at the bottom.

I made a full front diff/steering post/centre diff/rear diff top plate that I hope will stiffen the chassis a lot over the regular front and rear braces, but without any vertical triangulation I may still need to use one of the stock diagonal braces to make it rock solid, I hope not but I have holes for the front brace if needed and there would still be a small weight saving with it.
More to come soon.
Hot Bodies Lightning 2 Pro carbon, Mega 22/30/2, MMM, 4s3-5Ah.
Tamiya F201 carbon, Mamba 7700, MM, 2s A123 2.3ah.
Xray XT8, 1518, MMM, 4s5Ah.
Lots of boats.
fastelectrics.net