How in the world do you get the bricks to follow into the house to paint a mini rooms? I've tried several different ways of clicking before using the computer to attempting to build in my office before using the computer, ect. It saves like 10 mins. Please share how this is done, so I can do a run worthy of attempting.

Absolutely will tell! All you have to do is have lintels out when entering the pc in your office. (No need to start building them). Then they should show up in the level, from there you can start building (it is possible to still change between one or 3 walls to build, but you cant change to another tool until you have built everything, then it dissapears). If you can't make it work, add me on Discord and I can try to explain better there!

Sorry for taking a while to answer, have not had the time to check speedrun in a while.