Which bits are broken? If the driver's let the "magic smoke" out, then that's not a rebuild, but replacement. If the LEDs have karked it, then it may depend on the strength of your epoxy.
Rebuilding's worth doing; it's a past time I've had to endure countless times after the rutted nightmares of south west London have taken their toll. However, after 3 months of almost daily tweaks, extra blu-tac and gaffer tape, there's been very little repairs needed since June. It also teaches you patience, grasshopper.