In the style of the Enhance SRS ROM and Targeting ROM, the Excalibur Targeting ROM installs software (as in, it doesn't take a device slot and uses minimal power) that adds a series of aiming reticles in front of your ship. That part at least is working perfectly.
I tagged it as a dev mod because I'm nowhere near finished. I'm currently working on making one of the aiming reticles lead targeted enemy ships (and failing miserably at the moment ). I also plan on making dock screens (more new stuff to learn) that will allow for different configurations and selectable graphic sets. Obviously there are more updates coming soon, and in testing, saved games will not pick up new overlay settings.
[Edit] Re: saved games, come to find out I outsmarted myself. Although it will eventually be replaced by a dockscreen that includes an install/uninstall option, currently if you se the ROM item it will install or uninstall itself, which in turn uses <OnEnabled> and <OnDisabled> to add or removed the overlays. So, if you load a saved game after making changes to the overlay settings TLisp code, just use the item to uninstall and then install it and the new overlays will have your code changes.