Hi,
Welcome to Paddleducks.
OcCre make nice kits, but you may find this kit to be a wee bit small and top heavy for installing working steam without deepening the hull somewhat. I suggest you do some displacement calculations before you proceed much further. Wish you well with your project.
One of my Christmas presents was the Midwest V1 steam engine kit, and Midwest make nice kits. How about showing us some photos of your completed Launch.
cheers
kiwi