Project-based learning has been shown to improve student engagement and confidence in STEM fields, yet many educational robotics platforms rely on pre-assembled components that limit meaningful design, iteration, and problem-solving. This project investigates how a hands-on mechanical engineering robotics kit can support student engagement and confidence by guiding learners through the complete robotics engineering process. A spider-type robot will be designed using 3D-printed mechanical components created in Onshape and powered by a circuit board featuring an ESP32 microcontroller or arduino to simplify wiring while allowing for an advanced level of customizability. Alongside the hardware, a modular curriculum will introduce students to CAD design, 3D printing, electrical engineering, and programming using the Arduino IDE. The kit and curriculum will be tested with middle school students in a controlled setting. Data will be collected through task completion metrics, error frequency, and pre- and post-course surveys to evaluate changes in engagement and self-reported confidence. The project culminates in a research poster, live demonstration, and data visualizations summarizing findings.