Things You'll Need
Instructions
Land
Build a rectangular base with longer (1 x 8s and larger) bricks for the longer sides, and shorter ones for the short bricks. Only stack the walls a few bricks high, and extend the front end to make room for a driver, a LEGO steering wheel and seats. Leave spaces near four corresponding corners where a 1 x 2 wide (brick contains extensions wider than numerically indicated) brick containing a horizontal holder must be placed (LEGO wheel arches may be used to create wheel wells, if desired). The extensions sticking out of the sides of the 1 x 2 W bricks must be sticking out of all four sides of the transport.
Place LEGO wheels on all these extensions. LEGO wheels with tires are preferred, but any LEGO wheel will do.
Consider leaving the rear end of the transport open. The ends of the walls can be inter lain with 1 x 2 W bricks that have horizontal clips. If facing inward from the sides, these clips can hold LEGO swinging doors.
Add window bricks to the sides of your transport, and fill in the walls around them with appropriate bricks. A vehicle with large window openings should have 2 x 2 x 2 seats inside for figurines to sit in, if transporting people. If transporting LEGO barrels, for instance, the windows might not need to be so large. Build the roof out of a flat plate brick that corresponds to the size of your vehicle. The roof can be adorned with various flat tiles to make it smooth.
Build doors for the front end with LEGO bricks and LEGO windows (LEGO doors can also be used). Attach the doors with hinged bricks. Leave a windshield space open, or fill it with a clear LEGO windshield brick.
Construct a sloping roof using the thinner (1 x 2 x 4), flat bricks. Augment the edges with sloping roof tiles. Decorate the top with flat tiles. Arrange different colors into patterns for a more authentic look. LEGO antennae and satellite dishes can be added to the roof as well.
Air
Construct a tube shaped, or octagonal, structure similar to the one described in Section 1. Create a sloping structure by stacking bricks off center, diagonally. Leave spaces open that are large enough to accommodate clear window bricks -- if none are available, holes left in the sides of the "plane" serve as appropriate windows. Remember to leave enough room for the wings!
Fill the transport with seats for passenger figurines if transporting people. LEGO boxes and barrels make good cargo as well.
Make the wings from long, flat and triangular -- slanted -- plates. These plates come in "right" and "left" varieties, so be sure to attach each one to the correct side. Wings can be made thicker with extra plates; sloping roof tiles are appropriate for this. LEGO nose cones or clear, red 1 x 1 flat tiles function well as running lights.
Connect a right and left slanted plate using a wide plate brick. Line the slanted plates up, so that they reside next to each other in the shape of a tail. Decorate it with specialized flat tiles or just different colored tiles arranged in patterns. Set it aside to attach later.
Consider the front and rear ends of your air transport. The tail end should taper down to almost a point before the tail is attached. This can be accomplished by stacking corner bricks into the walls with the perpendicular ends facing inward. Successively thinner tubes can be strung together in this manner.
Construct the front end using the methods described in Section 1, but allow for a tubular-shaped cockpit that slowly tapers into a round or slightly box-like end. Multiple steering wheels should be placed at the seats to account for pilot and copilot.
Sea
Stack long and thick bricks (2 x 8 or 2 x 16) diagonally from both sides of a thin base made of a plate (4 x 8 or 4 x 16). The structure should take the form of a "U," with the walls eventually being stacked vertically until as high as desired. You can add wider plates as the structure grows vertically to make decks. Build separate decks, and space them apart to allow for any LEGO mast poles that might be in your collection. Holes left in the walls can serve as portholes when windows are unavailable. Use brown or gray bricks where appropriate.
Taper the front and rear ends to rounded points using the technique described in Section 2. Add LEGO poles and flags to make your sea transport more realistic.
Build a rectangular room for the deck of your sea transport, remembering to make large windows so that you can see inside. Make sure the room is large enough for captain and sailor figurines, their seats and a LEGO steering wheel.