i pulled the entire liner out, including stock vent tubes. filled in the front vents, opened up larger vents in the rear, made a new liner and installed the oem rubber tubes where I wanted them. while the liner was out i cut the top to make it a low profile hood.
here are a few pics to see how i did it.
I used tape to line up the cut, and used a jig saw to cut it with. once cut out i used cardboard to make a tempate to fill the cut area. made it the same shape to it fit in perfect. (use duct tape to cover the carboard so teh epoxy does not stick to the cardboard). then laid in my cloth on the inside to create the support substructure for the area. I think i used one layer of 8.9 oz and one layer of 26 oz over that (inside).
then once the inside was finished i flipped it over pulled off the cardboard and used marine filler to do the outside work. takes some time to get it smooth and blended to the shape youe want - lots of sanding. then went over that (once dry) with a coat of epoxy to seal it.
also, you might want to run a lowered handle pole bracket or your pole will sit up higher than the nose/hood. you can use the same oem hood brackets.
*note in pic #3, it is important to have your favorite shop dog with you during the cutting process... LOL