any reason not to cut it?

I wish I could figure out what you are asking...

this is my set up 1470259101_zpsrrxsk9bt-jpg.jpg

the top part is one piece
which mean i have to disconnect the two large pipes going into the fenders before i can get to the air filter

there is no actual lid

im thinking of cutting this section out
(marked in red)

which will be about 10 inches across
then i figured id buy a 14 inch lid to put across it

any reason this wouldnt work ?

lid.jpg