First step: read up on ship building techniques, to learn new things and to remember lessons learned in the past but now hazy. I found Ship Modeling from Stem to Stern by Milton Roth and especially Ship Modeling Simplified by Frank Mastini to be very useful, they are both easy to read, follow, and understand.
Second step: Build a straight, flat jig to support the hull. I used some red oak I had on hand in my woodworking shop.
Third step: Free the laser cut keel and frames from their boards. The keel, stem and stern pieces had to be spliced together. The factory cuts are correctly proportioned. However...
Fourth step: the rig slots on the reinforcing bridges are not correctly located so I am fabricating new ones from 1/4" (6 mm) birch plywood. Thankfully I have a pretty complete woodworking shop to handle situations like this.