When batch sparging, you can calculate all water volumes(strike, sparge, etc.) with a sight glass on your HLT, except for post-boil finish volume in the BK. You'll need another sight glass or the graduated dipstick for that. And you can pump from a keggle or a cooler if that makes a difference. The 72 qt coleman Xtreme cooler is hard to beat for versatility. They can also be had sometimes for pretty cheap. If you sold one of those keggles for $150 or so, your pump would be about paid for. But once you weld them all up nice you may just want to keep all that shiny for yourself...