The only bit of advice I have to offer at this point would be to watch your stance width. It’s a biped. It will need to balance on one foot while it steps with the other. Unless you plan to get extrordinarily tricky and get into the physics of the way that humans walk (essentially a series of controlled and arrested falls), you’ll need to work around a “zero moment gait” design that keeps the bot’s CG within the footprint of the points in contact with the ground during the stepping sequence. In order to do this, you need to be able to swing the body around to keep it over the grounded foot, and in order to do that, you need to keep an eye on how far apart you place the legs. Too wide, and your bot will have to waddle when it walks. Much too wide, and it won’t be able to walk at all.
The zero-moment gait: a biped’s best friend.