It appears that evacuation system would be easy to fabricate for WAY less than 1500 bucks....
Completely agree. I decided to go with the contractor because I am not comfortable with putting holes in my foundation or side of my house. It's my one Achilles heel on renovations. I've had such little time to tackle any projects outside of work but wanted to get it done.
I say if you're comfortable with it and have the tools, you could probably do it yourself in an afternoon and $500.