The ornamental design for a surface-mountable workstation with large horizontal work area and storage, as shown and described.
FIG. 1 is a top, front, left side perspective view of a first embodiment of a surface-mountable workstation with large horizontal work area and storage illustrating our new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a right side view thereof;
FIG. 6 is a top view thereof; and,
FIG. 7 is a bottom view thereof.
The broken lines in the drawings illustrate environmental material that forms no part of the claimed design.