Sims type build mode?

I would like to create an in-game architectural build mode similar to which is seen in the Sims. I’ve tried using the spline tools, but this just got messy fast. Does anyone know if this is possible to do in Unreal 4? And, if so, how to start?

I would think spines is the way to go but you need to put constraints on that limits it to a grid you define.

Have a look at the spline fences and railings on the marketplace, thats pretty much all you want for the building walls, but if you are going just straight lines then you could just spawn the mesh multiple times repeating along the x or y axis as many times as you need. Have a look at some turn based game tutorials for placing items during gameplay too that should help.

I did take a look at the spline fence, and it seems like it does what I need it to do. The problem is, I can only get it to draw the wall while out of game. The idea is for the player to be able to draw the walls. How do I make it editable in game?