Front end rebuild - what's it worth?

Will you be doing at the guys shop and having them invoice for labor and parts. All work billed from.his shop and a percentage added for the shop. Like his other work they do. Or on your own and you bill the customer? In this day and age
If it is the ladder you wil be on the hook and possibly on Judge if a,cheapo ball joint, tie rod end snaps down.the road.
Not tring to be a Debbie Downer but. Keep in mind I have friends with real shops and thet have been down this road when later a part has failed.
I will help a friend do his own work but not do work, not worth the risk.