best thing about 'home made" is you can fit it where you want to, I never use a pump anymore, just a scoop for when you are travelling and use a bucket when stopped, I just got sick of rusty/broken pumps and switches, the bucket never runs the battery flat or breaks down, the bigger the better (withing reason of course) and the more surface area the better, there is a lot of thoughts on colours and stuff, but I have never really found anything better than any other colour, so what it is is OK, and make sure the overflow drain is big, because the scoop will pump some water in when under way, I also use a 'stopper" click hose fitting to disconnect tank when not needed, works OK and being plastic, it does not rust, by the way do you have an "Alloycat" or are you just being general when you said and "ally cat"??