Well-- you dont have to reinvent the wheel as the sort of small stream enhancemment has been done by volunteers hundreds of times here in BC
Start here:
http://www-heb.pac.dfo-mpo.gc.ca/community/cip_e.htm
The guy that has to make sure your proposal is feasible from a technical and a biological stand point is the Nanaimo Community Advisor (CA) Barry Cordocedo. His number can be found in the directory. ( tell him Bryan from Courtenay sent you-- he will either kick you out of his office or grab his waders to come and help you
)
Its up to HIM to deal with the red tape ( and yes , there are things that have to go through the process, such as Prov/Fed transplant approval, evaluating potential impacts to existing wild coho etc)
He may hook you up wuth another local enhancement/streamkeeper group so you dont have to run solo.
Right off the bat, I saw red flags when you mentioned the Scotty instream boxes. They are a great educational tool and even have a place for small stream trout enhancement. But as a SALMON enhancement apparatus, I can tell you that they are not practical.
( the CA in Prince George calculated that in order to handle the eggs from one female chinook, a hole in the streambed the size of a refrigerator has to be dug. Ever tried digging in a compacted stream bed??? I have and can tell you that you dont want to go there.
Spawning gravel availability is seldom the limiting factor in small stream coho populations. You just might find that you can do more for the fish with a stream bank planting program , or fencing if you are in an agricultural area. A proper assessment is required before proceeding, but this can certainly be done.
Good luck, and let us know how you make out.
20ft Alumaweld Intruder