In this tutorial you will learn how to make a clean interlocking using spawn points as guides. First you need to set down your object then put spawn points on it like so then set the object to place at start no and start a new round place another object like so and then spawn the other one and delete the spawn points there ya go
i do something very similar to do this it works well but i use cones the cones fall then i match up the white markers its easy because there is nothing to cause an obstruction also works for interlocking at an angle
a much much easier way is to just put the objects against each other, then put a double wall in between the two boxes so the line in the middle of the double wall is in that tiny crack between the two objects, then set one to not respawn, and now it will be straight, and you know how far your going into the other object. [][] its kinda like this, where the squares are double boxes, and the line is the double wall