Under the thwart you should find a block of wood moulded to it, that could be your centre anchor point.
Aft will be on the forward face of the aft tank, down low ish! You may find a block in the tank but if not,beef up the tank face inside the tank to take bolts or screws.
Forward you can pick the tank face again or the centreboard capping.
Genoa tracks, or the bearing point of the sheet to pulley is about 21ins (old money) from the centre line of the boat.
You could use a smaller jib and sheet it on the fordeck out the way of the crew sitting on the side seats !
If your crew likes to sit on the sidedeck then the tracks on the sideseat is ok but not if your crews like to be in the cockpit ???