Looking good here as well - wondering if the close proximity of the battery vent caps and the slide-on metal lid will allow for early corrosion from the battery fumes. I might want to add some sort of plastic sheets affixed to the bottom side of the lid if it would still allow the lid to slide off. It appears the only fumes venting will be the area between the slide-on lid and bottom metal case sides.
The hinged type steel box lids seem to have alot more space between the top of the battery and the inside of the hinged lid.
Maybe not a problem at all - just thinking about things like this... Maybe a good rubber spray on something would help...
Roy Ken