Ohh, I've forgotten to explicitly add, wheels small enough to fit the design. A fundamental flaw of current bike design for small riders is that companies are being cheap and lazy by using 700c wheels on small frames which totally compromises the design. The centre front distance simply can't be brought back far enough with 700c wheels so they bring the seat forwards instead.

The frame geometry needs to be worked out properly first and THEN you figure out what wheel sizes will fit. Wheels first is not good design.

Anthony