Some 40K players have been busy putting together a turn based game where you take on the role of a Chapter Master and get to order your chapter around. Having spent the last hour or so playing it, it's clearly still in development, but as a freebie it's not too bad.
http://www.mediafire.com/download/jpmga ... Master.zip
Enjoy.
Fan Made Turn Based Game
Fan Made Turn Based Game
Painted Minis in 2014: 510, in 2015: 300, in 2016 :369, in 2019: 417, in 2020: 450