3D CAD Modeling for Innovative Walking Cane

I am a Year 12 student in Australia Melbourne Victoria completing a Visual Communication Design (VCD) project. I have designed a modern smart walking cane and need it recreated as a professional 3D CAD model based on my reference images. The model must be accurate, clean, and fully suitable for 3D printing. ( if you can print it ) Important Design Requirement

The underside of the handle must remain open so that a metal tube/shaft can be inserted into the handle during assembly. Please do not model the handle as a completely solid piece.

The opening should:

Be centred underneath the handle.
Be sized to fit the metal shaft securely (I can provide the exact shaft diameter if required).
Allow the shaft to slide into the handle for assembly.
Maintain sufficient wall thickness around the opening for strength and durability.
Approximate Dimensions

(All measurements are in millimetres.)

Overall height: 900 mm
Handle length: 140 mm
Handle width: 40 mm
Handle thickness: 35 mm
Shaft diameter: 22 mm
Opening inside handle for shaft: 22 mm diameter (or adjusted to suit the shaft with appropriate tolerance)
Wrist strap width: 20 mm
Wrist strap thickness: 3 mm
Rubber tip diameter: 45 mm
Rubber tip height: 35 mm