Holes in bottom of frame rails?

[CraigS]

The tube end in the rear of the car is inside the trunk aluminum.

[edwardb]

Edwardb, I suppose I could have asked permission before I referenced your pictures. I'm impressed with how well documented your project is. I like that you even include part numbers for most items. Since I'm also looking at a coyote build, it's a big help.

Thanks. Glad you find the information helpful. No problem at all using the photos. Didn't mean to suggest otherwise.

The tube end in the rear of the car is inside the trunk aluminum.

Not the ones the OP is asking about. As pictured, the openings through the bottom of the 4-inch main chassis tubes.