Install Mid-Level Horizontal Supports

What happens here

Proceed to install additional horizontal supports between the stringers at the mid-level step positions. For each piece, repeat the process of positioning and securing it. Critically, use a spirit level to confirm that each support is perfectly level and consistent with the previous step. A framing square should be employed to verify that the connections to the stringers maintain a square assembly, contributing to the overall stability and accuracy of the stair frame.

Goal: Additional horizontal supports are installed at intermediate levels of the stair frame, further stabilizing the structure and defining subsequent steps.