Hi all! It’s me again 
as I said earlier (https://plus.google.com/+JarekSzczepanski/posts/MLTxKWexDeM) I’m going to cut top&bottom plates from 3mm aluminium.
I prepared DWG files based on files from @Benjamin_Groves and latest parts from Grabcad. They are ready to sent to water-jet cutting. Anyone could look at them and spot any obvious mistakes? 
Changes: holes are 3.1mm (instead of 3.5mm) and top plate is slightly longer because front differential is mounted flat