Sorry for asking basic questions, I don't mean to bore you all, but, as I'm new to all this I'm sure I will. Bear with me, we all have to start somewhere.
 Just wondered what handbreak set up people use for reliant axles with drums?
try to use the original reliant h/brake setup from the donor vehicle, including the strengthening chanel/bracket from underneath the body that the lever bolts into, this is ideal for welding to trike chassis and refitting lever onto, you may have to shorten cables, but thats not a major job using steel wire clamps etc. use stainless fittings from yacht/boat rigging.
good luck with the build
pete