Grate? Hmm... interesting idea. What is the specific item name? EDIT: there's only one item named "grate".
Anyways, I've been thinking about using the Borg blocks to disguise a giant ramp like the one in the top right part of the map. The big issue with falling off is how long it takes to get back up. If you can simply run up it's less of an issue.
The item is "Grate - Generic Ship 01" it is 5X4X1 and might work to build steps and platforms.