You don't need the drain where you have it. You need one at the ends of each pipe where you have the caps. On the last run you can put a 90 degree fitting or a "t" fitting if you plan to add more.
:old
I wouldn't keep any from a doe that only produced 4 to a litter. The best rabbit management that you have is culling. Everyone is to be culled till you prove to me I need you to make money.
And if I got does that produced small litters I wouldn't go back to that breeder. That's why you need to...