well if your doing the internal vct feed from the cam buckets then you need enough oil to supply that aswell. standard 25 has 2 main 1.5mm feeds and a 1.5mm feed for the vct, so 3 x 1.5mm feeds all up. i personally used 2x1.6mm feeds with a 25 pump and vct, which works out to a little less flow than standard 25 setup, havent had any issues yet.
gates 30det belt is 150T so use 2 tensioners in the standard locations down the bottom, make sure the belt doesnt get too close to itself