According to our experiences, we usually use these formulas to evaluate lengths and areas of the data needed for 3D modeling and then make adjustments while modeling according to the practical conditions. More improvements would be made after simulation tests. The final precise data of the lengths and areas would be produced by the 3D modeling software.
Wing area calculation:

Wingspan length calculation:

The reference for typical values of aspect ratio can be found here:

Tail area calculation:

The reference for typical values of CVT and CHT can be found here:
