Pallet and collision

i have a problem with a pallet asset which i created in shade 3d 15.

i want using a forklift so the collision for the pallet is importent.

if me import the pallet as single mesh the convex hull looks ugly / wrong.

if me import as skeletal and set each piece of wood to box collision it looks fine
but the parts not stick together, all pieces are loose.
means the nails are missing.

how can i stick the parts together?

(me solved myself with a workaround in the 3d editor by using extra objects and the UCX_… prefix.)

currently its possible to copy/paste collision boxes and edit it in 3d view.