RE: V of the tree treestand?
If he's gonna do that he should at least make himself a vee board to sit/stand on . Basically it's a section of 2"x 12" cut to fit the distance between the two limbs of the fork that has a vee notch cut into each end . Attach a ratchet or cam strap to each end to secure it to the limbs , or just nail it to the limbs . I don't know of any manufactured stands such as you've described , perhaps he would consider a ladder stand instead .