isnt the point of the toolbox to separate the "wet" parts of the pump from the "electrical" parts of the pump? aka head on outside, motor on inside?
if something leaks here, all that water just pools in an out of sight, closed tool box until...."POP"
i had to do the same for my pump tool box. Now that i moved the pump onto the stand with an enclosure, i couldnt find the old shorter screws. Luckily the longer ones didnt see to bump into anything internally.
i use a 14.4v cordless dewalt on a 2 roll cranknstein. Been using this set up for years. I do use an entire battery charge though for a 10 gallon high gravity batch.