Greetings Napkineng,
Typically mesh can be used in a laminate if it is accompanied with a layer of film adhesive or you can buy some prepreg types (very spendy it's easier to use dry mesh and a film adhesive IMHO).
I would apply one layer of film adhesive to the mold, debulk, apply mesh, debulk again, then start with prepreg plies.
Most applications of this sort are for lightning strike which may not be your issue on the belly of a helicopter (but then I just do composites not an aircraft designer).
Last but not least consider possibly using a foil in lieu of a mesh. I have applied it in strips on helicopter parts as well and that can be an effective way to carry charge.
Foil is trickier in lay up though.
Hope this helps and good luck.
ps, watch you overlap splices to make sure you get good conductivity if splices are needed.
Composites and Airplanes - what was I thinking?
There are gremlins in the autoclave!