You can try sending a message to Andi Roselund @Ultradust here on talk bass. That’s how I’ve done my two build orders. In the meantime you may want to read his Jan ‘23 update on the “Moollon Musical Instrument” Facebook page, which include prices and available options. He’s supposed to be putting out a new company update any day now. There’s also a good FAQ on the “Moollon Basses” Facebook group, although some of that info on prices/build time/and available options is now out of date. It really is best to read up on all that info first (if you haven’t already) before reaching out to them with any questions. It will make it quicker and easier for both you and Andi.
PS be ready for a 3-4 year wait once an order is placed (It’s worth it!)
Who in their right mind would want to wait 3 or 4 years for an instrument, as good as it might be? A Moollon P-bass might be great, but guess what, some Fenders are too, or if you feel fancy, Lull make amazing stuff too.