Mesh holder holes

The request

I've attached the STL of a shower door holder I printed. The file is at one tenth of the printed size (my slicer scaled it by 10 to print), so import the mesh and scale it by 10 about the origin to get real millimetres, and keep it exactly as it is — don't remodel it. Then add two 4.5 mm through-holes in the floor of the channel for mounting screws: on the channel's centreline, each one quarter of the length in from either end. Measure the mesh first; no dimensions are given. Keep the mesh's own origin, Z up. Name the sub-part `holder`.

What the AI judge checks

• The overall form matches the reference: the same kind of object, the same silhouette from the matching angle, allowing for the requested change: the holder scaled up ten times to real size, otherwise unchanged, with two through-holes added in the floor of the channel
• Proportions match: the relative sizes of the major dimensions agree with the reference within what the eye can judge, allowing for the requested change: the holder scaled up ten times to real size, otherwise unchanged, with two through-holes added in the floor of the channel
• Every major feature visible in the reference (holes, slots, bosses, tabs, lips) is present in the result, allowing for the requested change: the holder scaled up ten times to real size, otherwise unchanged, with two through-holes added in the floor of the channel
• Those features sit where the reference has them, allowing for the requested change: the holder scaled up ten times to real size, otherwise unchanged, with two through-holes added in the floor of the channel
• Nothing is present that the reference does not show — no decorative or unexplained geometry, allowing for the requested change: the holder scaled up ten times to real size, otherwise unchanged, with two through-holes added in the floor of the channel
• The holder is the imported shape unchanged — the slightly bowed side walls and the open channel are as in the reference — apart from the two holes
• Two round holes go through the floor of the channel on its centreline, one near each end, and nothing else was cut

Measured checks

• one sub-part named holder (gate)
• the imported holder is still declared as an import (gate)
• the mesh was scaled to real size (gate)
• the holder's own volume survives (gate)
• nothing solid was added inside the holder's own footprint (gate)
• the +Y hole clears 4.5 mm through the floor
• the -Y hole clears 4.5 mm through the floor
• the floor is still there around the +Y hole
• the floor is still there around the -Y hole
• measured the mesh with the oracle