Great guys, many thanks - this forum is just excellent wealth of the knowledge
MichaelR: "The thin guage flat part with the single hole tab.... dunno. Is that a lower engine cover panel?" - yes, I think so, but cant prove it so far.
MichaelR: "Do you have a Chilwell parts manual to reference the MK-III series part numbers?" I have just 63/26 from 7/42 and 63/76 from 6/44? but neither covers Mk.III variants I am affraid
Attached are engine area parts in unrestored condition - Im working on it, hopefuly will be able to put some assembled photos soon.
Attached also inner sides of the both radiator covers L+R side (unrestored)