Why do you care? He's not asking for your approval. If you can't supply him with info, then say nothing.
I took two 360 pass car pans, cut off the bottom of one as low as possible and added it to another sump cut off as high as possible and still be able to mate them up. It worked out to be just about level or just slightly recessed from the k-frame bottom. It gave me about a 7qt pan w/filter. That was pretty easy. Extending the pickup was the hard part.
