SVA and CB install - 1992 Nissan 240sx hatchback

[Batman]

1st. I bought a stereo amp install kit. 4ga. wires, power distribution blocks, inline fuse etc.

I will be running a stock 40ch CB, SVA w/amp(got FireCpt809's old setup) , 2 motorola amplified external speakers(one on sva, one on cb), and a SWR/Watt meter for 27MHz.

my question, should i run negative to chassis or direct to battery? with this equipment(the sva has the 45w amp, have not decided on using it or not) should i run off the battery positive or the fuse panel in the cabin?

besides RFR to passengers(should not be a problem at 5 Watts) what are the problems with mounting a 1/4 wave vhf whip to the hood lip with an L brack as opposed to drilling holes for an NMO mount in the roof?

object of install is minimum holes or damage to vehicle interior.

I have two CB's available. a Cobra 75WXST and a Uniden PC-?? (similar to a cobra 29).
uniden seems to fit a din bracket.