As far as the wood, I?m not a fan. Wood just doesn?t belong on an AR platform but that?s just my opinion so don?t let that sway you.

For the first part, although I really don?t know what you mean, if the receiver isn?t made to normal specs I?m guessing you?ll have trouble getting everything assembled since the reason for having specifications in the first place is to have a known standard for parts compatibility.

For the second part, if having a standard pistol grip is reason for building a rifle then I have a box of them I?d give you and you?d have reasons to build a dozen more.

For the third part, I have to admit I have no idea what you?re talking about.

Best of luck with your project and I hope you enjoy the whole process.