Tools:

• Colorschemer – Plan and share color schemes using actual LEGO colors.

Reference:

• Brickset – Database of official LEGO sets, useful for researching set inventories.
• Micropolis Standard – The official Micropolis standard maintained by TwinLUG.

Building Tutorials/Instructions:

• Chubbybots – A prolific mech builder’s YouTube channel, with a mix of tutorials and design videos.
• De Marco Bricks and Wheels – A YouTube channel devoted to small cars and trucks (almost exclusively 5-wide).