New answers tagged size
I don't know of any comprehensive parts dimension reference, but following should help you get started. You can calculate part dimensions using fundamental dimensions of LEGO parts. The distance between holes in technic bricks is 8 mm (8 mm is one of core dimensions in whole LEGO). So for example, lets take a beam (aka liftarm) with 7 holes, then length is ...
Lego Juniors is fine for 3-year-olds who know not to put toys in their mouths. My son, when he was three, was playing with regular System Lego (of which Juniors is a subset) and it was okay. If it's important to you that your son have things like vehicles, or minifigs, and that he build the whole set himself, then Juniors is the way to go. Otherwise, I see ...
LEGO Juniors sets use normal LEGO System bricks. In other words, they are exactly the same size as the "normal" LEGO bricks. However, the Junior sets are specifically designed for younger children. They often have large single-use pieces (for example, for walls or frames), and are generally very easy to construct. They also limit the use of small or ...
So the box says 49 inches long, the official description says "under 50 inches long". I just measured the width (about 13.25 inches) and height (about 9.5 inches) on my assembled set. So a rough minimum inner size box would be 50"L x 13.5"W x 10"H.
There used to be 2x12 bricks a long, long time ago: There a plenty of legacy parts that aren't included in LDD, and it looks like this is one of them. This part dates all the way back to 1954. I don't think that they've been used in a set since then, and I don't think they were updated to use tubes on the underside or to not have slots in the end. I ...
Found a 4x12 brick on bricklink (http://www.bricklink.com/catalogItem.asp?P=4202) but no 2x12. You could just stack 3 2x12 plates together if the overall appearance doesn't matter.
It seem there is no 2x12 brick, you can use 3 pcs of 2x12 plates... I have found the modified 2x12 brick with pegs (47855).
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