Unless you can bend pipe, weld, and tune yourself, you arent going to be able to build a homemade system that is significantly cheaper than the ADC kit. Also, with that much HP you will need a new clutch and LSD. If not right away then soon after.
Your friend with the Honduh is tainted by EVERYONE making turbo kits for his platform. Even still, a good widely available turbo for a Honda, Nissan, Acura, etc. is gonna set you back AT LEAST 3500
Factor in all the extras like having a dead platform, quality, tuning, etc. you get from ADC and they are more than justified in their price.
The guy that built Blackwidow's set-up had done plenty of Honda turbo pipes. Its a no brainer. After he was done with his SVT, he said he would never again make one for a Contour.
If you ever spend a significant amount of time looking at the bottom side of your engine you will know why the piping is worth so much
