NickM, do a search for "SAS". This site is for off liners only and has many helpful folks there. I am an off liner only and I have the B-26 as a flyable in quick missions, full mission builder and in some campaigns it shows up as AI aircraft.
Good luck.

Anyway, Taxman, tell me about your install & How you got AI Marauders? Remember I am not very tech savvy. All I have is the standard IL2-1946 (and BoE) patched to the 4.11m with no other gizmoes
Nick, I have it working in "DBW" 1.6. As of now it will not, as far as I know, work with 4.11. However there may be a version that works with 4.101 if so it should work in 4.11 but you may need a "MODDED" version of 4.11 to have the B26. You need to log on at SAS and ask your questions. If not very "tech savvy" you may want to just keep what you have for now. Ask questions and read the install instructions for all the various MODS so that you understand what it is all about.
Just a note, from my reading over at the SAS site there is a group working on a one or two step install from 4.101 to DBW 1.7, right now it is quite a few steps to get there. They may be also working on 4.11 in order to bring it all together.
Hope this helps.