Crossover help for 2 way Supravox and Ribbon

Hello my friend , i need a crossover specialist to help me , i want to build a large 2 way speakers with
Supravox 285 gmf 8 ohm 99 spl and
Fountek neo X3 ribbon 8 ohm and 95 spl

The box will have aprox 220 liters and the ribbon will be flush mounted on the baffle .
Please help with crossover scheme . tanks !!!:)