That looks nice. Don't think you need the gussets.
Do you have a picture of the alternator/generator bracket?
Will you have enough belt wrap on all the pulleys to transfer the power to them and from the crank pulley without the belt slipping?
Where did you have them cut? I'm currently looking for a company who can accurately cut some stainless sheet and hopefully laser engrave it as well.
Thanks,
Grigg