Sign Builder

I am looking to create a sign builder script using php and jquery.

The user has two options to calculate a price. Write in a textarea or upload a SVG file.

Textarea function:
1. User can write in a text area
2. select font (from array)
3. user defines height and quantity
4. select color (from array)
5. select material (from array)
6. *IMPORTANT* size proportion is calculated automatically (Saved to array)
7. *IMPORTANT* Pathlength calculated automatically of text, so total price can be calculated (saved to array)
8. Display PREVIEW like example

Upload SVG
1. user defines height and quantity
2. select color (from array)
3. select material (from array)
4. *IMPORTANT* size proportion is calculated automatically (Saved to array)
5. *IMPORTANT* Pathlength calculated automatically of SVG file, so total price can be calculated (saved to array)
6. Display PREVIEW like example

Website reference
https://www.rotulowcost.es/es/rotulos-led-neon-flex/letras-neon.html