Watch some of Hans' videos. If you can make a head like he does, then you can build whatever you like. Then practice practice practice.
The head cement is Deer Creek's Diamond Hard UV resin. I use it for two reasons. I hate having racks of flies with their heads drying. The UV is dry instantly so I don't have to avoid dust. Also Diamond Hard dries tack free, so I don't have to go over it again with another varnish. That is rather self defeating.

For my flies a head like Hans makes is my aim, but shiny heads sell so for the ones I sell I have to do them.

Cheers,
A.