I have a series of points that mark the edges of excavation units, I would like to create a layer of an outline connecting the points. The end goal is a layer displaying a grid of the excavation units. I've tried the points-to-line feature, but the only success is creating horizontal lines using Northing and Easting as line and sorting features. At one point, I was able to use the selection and construction tools to complete the outline and have it selected, but not only could I not save that data as a layer or new shapefile, I have four separate blocks of excavation units marked and starting on another block automatically cleared the selected grid.
I'm including a photo showing the situation, the red Xs mark the corners of units, they are each a single point.
I would like a layer that is a grid, demonstrated in part by the black lines drawn on the picture.