I just finished modifying mine tonight. Patched up the extra large hole someone made before me on the scuttle and I guess couldn't be bothered filling and shaping it. Been at it the past 2 nights. Absolute nightmare of a job and a slow process! Now it's serving a purpose directing the air into the filter. It's the second one I've worked on now. The prep is the hardest. Getting the shape etc. Then the filler splits at times where it meets the scuttle. Difficult in some places.
Or... long story short... I'd buy one too 😂