I'm following instructions from Craig White and Roy Niswanger and making modifications of my own based on locally available supplies.
The first thing that I had to change was the main reflector. Both the instructions call for a 11 inch clamp reflector shop light. Couldn't find this anywhere, so I subbed it with a 12 in stainless salad bowl from the dollar store. I had picked up the duct reducer some time before and I made the hole in the bowl to mate the two together. I've only just started cutting out the hole where the flash will fire through. Will post those pics as the project commences.
As I already have the off camera flash and the TTL sync cord, I expect that the entire build will come under CAD 15.00. Compare that to some of the professionally available flashes which start at USD 100.00.
Salad Bowl - No Frills Dollar Store section. CAD 2.00
Don Park 4"-5" HVAC Duct Reducer CAD 9.50. I thought this pricey
Reducer on Bowl action - Templating in Nerdspeak
Cutting the opening for the reducer to fit
Methinks this is a neat cut
Test fit