I have a buddy who has his feeder mounted like your suggesting.. He likes it alot and it's something I may do in the future.. As for cleaning I have a commercial sink hooked to the back of my house thst drains into the gutter tile works excellent.. I wouldn't throw my fish guts back in the pond and cleaning fish on the dock will attract critter to your dock and ultimately your feeders..

I believe in catch and release. I catch then release to the grease..

BG. CSBG. LMB. HSB. RES.

[Linked Image from i90.photobucket.com]