You can build your point work entirely with plastic chairs if needed but I have tended to use a cast brass chair for dropper wire connection by filing one of the bolt heads flush with the chair, drilling through for a brass wire, I've used 0.7mm, once soldered just crop it off just proud of the chair surface to represent the bolt head.
Crossing vee and wing rails need to be connected by brass flat bar, for electrical continuity, filed flush with the outside of the rail foot so that plastic chairs can be cut and fitted up against the rail. Plastic slide chairs work well in use, we've used them on Love Lane successfully but brass are available and can be soldered to the rail but will have to be glued to the sleeper, personally if using these I'd pin them as well so that they don't move whilst plastic will of coarse be glued down with Butanone and tend not to work loose.
What do you get in the Waverley point kit ?
Col.