gronk2003
Well "gronk" its your motors, your installation, your customer with your name all over them! How much time are you willing to prove your metal? How confident are you.
As (jbartos) points out how many of those items he listed and how correctly did you address them there may be more. Any one of them can cause you and your customer problems down the road.
What are your $/hr cost?
Find a problem now or later.
Your at that juncture now. Its time to cut bait or fish.
If you worked for me, I'd tell you to decide "its your project. But do not make my company look bad".
Good Luck,
more to follow I am sure
pennpoint