the base rooms +all infrastructure and items are in place. The way I've set it out these rooms come in units of 4, with 2 kids in each, for a total of 8 children per unit. there is one splatter per unit, and each cell in each unit includes a 3x3 airlock space with a craftdwarf's workshop in it. The waterfall/scare trap for the climbing wall is built and linked up to a poor dwarf's repeater: a pressure plate in the main corridor. The turkeys have been bred and there is a gobbler and a hen in each cell, along with a nest box. The cats have been chained in the autosplatter breeding bay. Excluding the 30z splatter chute (I increased it because apparently 30z means guaranteed explosion on impact), the unit takes up approximately 16*8*5, counting all the plumbing and infrastructure, but excluding the access tunnel. These units are more cost-effective in large groups, as the plumbing and food infrastructure is designed to be easily extended in long rows and for rows to be easy to place side by side.
Only problem now is... I have only 1 child in the whole fort of 50 dwarves xD Guess that means I'll have some extra time to prepare the cells before the infant wave hits.
Also, does domestic poultry take fall damage? I only ask because I could get a higher rate of traumatisation with ducks due to them having a higher breed rate than cats, but I'm not sure as to whether they will take falling damage or not. If not, I'll just set up some door traps in the caverns so that I can eventually replace cats with scores of cave crocodiles.