It looks good. I just wonder if the rear mech has the capacity to take on the cassette/freewheel in combination with a 42t chainring? It looks like that mech will have to put up with a lot of hard work when you want to use the largest sprocket. Maybe you should consider a medium cage rear mech and a chainset with a 36t inner ring, if you want to make life easier/more pleasurable for you and the drivetrain. Maybe you could let us know how you and the bike get on when going up some hilly stuff.