Installation

In Blender open Edit, Preferences, Get Extensions, then use Install from Disk and pick the jetski_generator zip.

Usage

1. Open the Jetski tab in the 3D viewport sidebar (N). With nothing selected, pick a type, a design, a condition and how to show it, then press Add Jetski. Shift+A, Mesh, Jetski works too.
2. Select the craft to edit it. Surprise Me randomizes the selected craft in place; with nothing selected it adds a new random one.
3. The Design tab holds the design, condition, display and the Speed Effect. Hull, Deck, Cockpit, Extras and Colors hold the details; click a picture to open its gallery or use the arrows.
4. Speed Effect needs Display set to Afloat. Press Play to see the spray stream backward; Droplets adds particles (play from frame 1).
5. Steering turns the handlebar and the jet nozzle. The handlebar and nozzle are separate objects for rigging.
6. For game engines set Detail to Low on the Output tab and press Make Static; every part has UVs and Principled BSDF materials.