Nice. Good to see B2: The Keep on the Borderlands -- the best beginner/microcosm setting -- inspiring more and more indie adventure books. I see you have a print-on-demand copy of Keep on the Borderlands. The original version did not have an issue with DMs refraining the maps and locations notes due to how the booklet was originally designed. In the original version had 'saddle stitch binding'. You were expected to manually remove the the pages at the center of the booklet to better reference the maps and rule notes. The inside of the booklet had the of the Caves of Chaos and was deliberately not stapled to the booklet for easy removal and reference. In fact, you get the smoothest look at the map because the middle is not obstructed in any way. The idea was that you place the loose module cover, standing upright, next or behind to the GM screen to better see the maps while referencing locations from the booklet. Nearly every module published by TSR had loose covers, with a few even having fold-out panels (with the outer, player-facing, panel for things the characters would know, like an treasure map or an unfinished map of an unexplored island). Many module had removable center pages for important game notes, like major NPC stats and the like. In the case of the "S"-series D&D modules, like S1: Tomb of Horrors, they would have a lot of removable center pages dedicated to flash card artwork. Sorry if this was a little long, but I hope this was informative.
I'm currently running a hybrid sandbox mixing keep on the borderlands the village of hommlet and horror on the hill together. This looks like a nice alternative to keep on the borderlands if you wanted to mix up the Caves of chaos with something new though.
Much better layout! I liked B2 overall, but yeah, it's a bear to read thru and use the actual original book. I just use other notes and layouts made from the orginal.
