Unfortunately, i have no way to advise you on this as the BT codex is the only one i have never viewed.
Good luck though.
1 Suggestion i do have though is to make that Land Speeder a Tornado.
The autocannon/HB mix allows you to have 7 shots per turn and move
Also 4 of those shots are rending so if you REALLY need to, you can tear apart a tank.
Steve.