Replacing Defrost Hoses for 1971 Demon

I use the same method. 2" lightweight flexible aluminum black hose ,(Dorman 96034, $13. bucks 2X), and black Gorilla duct tape. Seems to last forever if not disturbed.
I know this thread is old, but...how brutal was the access? What did you have to take apart to get everything hooked up, and how long are the hoses when done? Since a shop had the cluster out to fix a few things, I lost my defroster airflow, and I'd rather not pay them a(nother) bunch of money to fix it.