Sorry Zorin but I think your source (autosports-gallery.co) is more likely to be the dodgy one. The TC was not launched until 1945. So a blueprint showing a 1943 MG TC is bogus. Can't see a date on the "blueprint" so it may be that someone just guessed 1943. It is a fact that there was no motor car production for the civilian market during the war.
I have to agree with ElAurens that the wings are too wide and the green is much too bright, an MG TA in green would almost certainly have been British Racing Green (BRG). However I think the wheels are just about correct. Compare with this:
Try this site for dates, production details etc for TA - TF:
http://en.wikipedia.org/wiki/MG_TB#TB
As a matter of interest what is the US term for what we in the UK call a bumber?
Regards
Pete