Looks very promising Roger. The tail art is the same as a 90th BG Liberator I did, so I'd guess its from that group.
The A-20G and Boston skins have their good and bad points. The bad is that the cowlings are made up from a dozen little patches, many of which are mirrored to little areas on top and bottom of the wings. For some colour schemes this takes some serious working out. However it shouldn't be too much of a problem on this skin, since the whole thing is just one colour. If the cowlings have anti glare panels, that might be a problem though. Like all old skins you can't play around with material files on the A-20G, so you won't be able to make the metal more reflective.
The good points are that there are a large variety of different schemes for the various A-20s. You have USAAF in all theaters, RAF ETO and MTO, RAAF, VVS summer and winter and French, both Allied and Vichy. Also this skin resides on three 1024 panels instead of the normal one, which means you get around three times the resolution of a modern skin. All the panel lines and rivets etc look a lot more realistically sized and detailed.
BTW Roger, I've emailed you a bmp file mapping the wing bugs. This should help you out.