Super Jet Need help reshaping 91 sn

i plan on rounding up the nose of my sn and cutting about 3"off the back. i also want to cut the hood as well. I have been reading alot of sj sn builds and have a few questions.

when cutting up the hood what happens with the vents? how does air get in to the motor. is there any guidelines for cutting?
also i pulled off the turf and the tray was cracked so i cut it up and started defoaming. it was also water logged so it will all be refoamed with 2 part foam. i also want to put drain plugs in. i saw people were putting like pvc in on the other side of the exhaust. what is that for? also want to fil in crack that the plastic piece covers on the nose.

heres a pic of the nose so far on cutting
photo-2.jpg
 
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