I've played chaos and necrons, and my new space wolf project is my first attempt at SM and their fragile land speeder!

I just bought a typhoon on EBay, but I don't want to limit it to just the typhoon role. While I will naturally put it together to allow for either heavy bolter or multi-melta, I would like to be able to change the class of land speeder around.

I'm planning on using rare earth magnets to attach the missile wings. Will this work (the model is in the mail)? Also, I am buying the bits for the Tornado. I know the assualt cannon/heavy flamer bits, but where do the "cargo" bits go on the tornado? Do the chin-mounted weapons go on their respective cargo bits?

I've never really seen a land speeder up close before (usually shoot them down by turn two&#33 so I don't know how feasible this plan is. Any help would be cool!