MOC Design From Scratch: Build Your First Original LEGO Model

Plenty of builders spend years working through sets, following instructions page by page — and all that time a small thought sits in the back of their head: I want to build something that is actually mine. That thing is a MOC, a My Own Creation. Original MOC design sounds like a high bar, but once you have a method, anyone can make the jump from zero to one. This guide walks you through the whole process.

Step 1: Choose a Theme and Find Your Inspiration

The first step in original MOC design is not picking up bricks — it is choosing a subject. Inspiration can come from anywhere: the corner shop at the end of your street, the plants on your windowsill, a scene from a film you love, or even an interesting mechanical mechanism. Once you have a subject, write down in one or two sentences what you want the model to say — for example, "an old-fashioned windmill that actually turns." The more specific your theme, the easier every later decision becomes. Collect reference photos into a single folder so you can flip through them and check your direction as you go.

Step 2: Sketch It Out and Lock In the Scale

With a theme in hand, draw a rough sketch on paper or in software, breaking the build into three parts: main body, details, and base. When you sketch, focus on overall proportions. If it is a small building 8 studs wide, roughly how tall and how deep will it be? If it is a small car, how are the track width and wheelbase distributed? Proportion is the skeleton of original MOC design — get it wrong at the start and the cost of reworking later is very high. Borrow the length-width-height ratios of the real object, or use the dimensions of an existing set as your baseline, so the finished model looks coherent and natural.

Step 3: Take Stock of Your Parts Inventory

Before you start building, sort through the parts you already own. This prevents the classic situation where you are halfway through the design and discover a critical piece is missing. Group your parts into categories — basic bricks, plates, slope bricks, and special elements — and note down what you have. At the original MOC design stage you do not need a complete inventory; the idea is to realize your design with the parts on hand. Missing curved pieces? Use slope bricks to fake a rounded look. Missing long beams? Join shorter ones with connectors. Only for genuinely essential missing parts should you buy individual pieces or pull them from existing sets. If your budget is tight, build a smaller version first to validate the structure, then scale up.

Step 4: Model It Digitally

Limited parts and expensive trial and error make software your best helper. BrickLink Studio is the most widely used tool for original MOC design right now, and it is free and powerful: you can search parts by colour, auto-generate step-by-step instructions and a parts list, and render realistic 3D images. Build your sketch as a digital model in Studio first, rotating it to check every angle, and fix problems directly in the file — far more efficient than repeatedly assembling and disassembling physical bricks. When the model is done, export the parts list and compare it against your inventory to see what you still need. Now you can build with confidence.

Step 5: Iterate, Refine, and Share

Once the prototype stands, the real work of original MOC design begins: iteration. Look at the model from different angles. Is the structure stable enough? Are the details lively enough? Do the colours work together? Change one thing at a time, build it, look at it, then decide whether to keep the change. Every photo you take during the physical build is evidence you can use to improve the shape. And when the model is finished, it is time to share it. On BrickPlans (brickplan.cn) you can find a large library of builder creations and instruction resources for reference; photograph your own model in high resolution, write up your design thinking, and publish it. Feedback and conversation with other hobbyists often spark the next idea.

From choosing a theme and sketching it out, to auditing parts and modelling in software, to iterating again and again and finally sharing the result — the process of original MOC design is the biggest reward in itself. Every small adjustment turns what is in your head into something real in a pile of bricks. Take the first step; your own original build is waiting for you.

This article was written by the BrickPlans editorial team. Please credit the source when republishing.