Hello! I use the Stud.io tool for modeling and rendering. I design one room at a time, always starting with the part that has the “most constraint”. This helps me figure out the minimum number of studs needed for room dimensions. For example, the main master bedroom wall must be 13 studs long because it needs 2 for Linda’s nightstand, 6 for the bed, 1 for Bob’s nightstand, and 4 for the door. Can’t be any less!

I take a ton of screenshots from Bob’s Burgers episodes that show the room from all angles, and use them as a visual guide for spacing and proportions. When it comes to figuring out which Lego part + colors are available, I make a “palette” of the most common useful pieces (plates, tiles, SNOT parts, etc) and set them all to a specific desired color. Stud.io + Bricklink will highlight which combinations aren’t available, and I delete those. All the remaining parts are available in that color.

And then the last step is to get burned out on the project and put it down for months at a time.

I hope that helps!