Digital BW, The Print

This is my first post.  I am a papermaker interested in making handmade sheets of Gampi for  digital printmakers.  To do so will require a mould suited to your medium.  Mould making is a very demanding skill so the correct dimension is essential. Are there standard sizes and weights? If so, please advise which are most widely used. Are the deckles trimmed?  I am using 100% Gampi. The color is a natural buff but I could whiten it with additives. Any advise would be very useful .