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Squaring the box is the one step worth doing carefully and by feel rather than by a single measurement: measure both diagonals, and whichever one is longer, gently push those two corners toward each other until the diagonals match — that's the whole technique, and it works on any rectangular frame, not just this one. Every later step depends on this box actually being square, since the top trim gets fitted around the tabletop inserts afterward, and an out-of-square box makes for an ill-fitting insert no amount of trimming fixes cleanly.
The top surface is intentionally NOT one solid panel — it's trimmed out around removable plywood inserts, sanded to a snug but liftable fit, specifically so a child (or parent) can lift sections out to access the shelf storage underneath, or to swap in a section with train tracks already set up. A small finger-hole drilled in the center of each insert is what makes lifting them back out easy without needing a pry tool.
| Item | Qty |
|---|---|
| Plywood or MDF, 3/4", ripped into three 31-7/8" x 48" stripsOne strip becomes the fixed bottom; the others become the top surface and its removable inserts. | 1 each |
| Pine, 1x6, 8 ft | 1 each |
| Pine, 1x6, 6 ft | 1 each |
| Pine, 1x2, 8 ft | 9 each |
| Pine, 1x3, 8 ft | 2 each |
| Wood screws, 2" | 1 box |
| Wood screws, 1-1/4" | 1 box |
| Finish nails | 1 box |
| Wood glue | 4 oz |
| Wood filler | 1 can |
| Finish | 1 can |
Overall cost: $$. Lumber prices vary by region, species, and season, so we give a band rather than a figure we would only be pretending to know.
| Part | Qty | T × W × L |
|---|---|---|
| Box long sidesPine 1x6 | 2 | 3/4" × 5 1/2" × 48" |
| Box short sidesPine 1x6 | 2 | 3/4" × 5 1/2" × 30 3/8" |
| Box bottom and top blankPlywood or MDF, ripped strip | 2 | 3/4" × 31 7/8" × 48" |
| Side legsPine 1x2 | 4 | 3/4" × 1 1/2" × 17 1/4" |
| Front/back legsPine 1x3 | 4 | 3/4" × 2 1/2" × 17 1/4" |
| Bottom shelf supportsPine 1x2 | 2 | 3/4" × 1 1/2" × 48" |
| Bottom shelfPine 1x2 | 2 | 3/4" × 1 1/2" × 28 7/8" |
| Side trimPine 1x2 | 6 | 3/4" × 1 1/2" × 28 7/8" |
| End trimPine 1x2 | 6 | 3/4" × 1 1/2" × 44 1/2" |
| Top end trimPine 1x3 | 2 | 3/4" × 2 1/2" × 34 7/8" |
| Top side trimPine 1x2 | 2 | 3/4" × 1 1/2" × 48" |
Buy 15 boards at 8 ft.
2 boards
2 boards
2 boards
9 boards
Assumes 8 ft stock, a 1/8" saw kerf, and buying each part at its own width. Change the board size or kerf on the full board plan →
Screw the box sides together with 2" screws and glue. Measure both diagonals — one will be longer. Gently push those two opposite corners together to shorten that diagonal until both measurements match; that's how you square up any rectangular frame.
Lay one of the plywood or MDF strips on top of the box and screw down with 1-1/4" screws. Predrill every hole and use glue.
Screw the side legs to the short ends of the box with 1-1/4" screws and glue, keeping them flush to the sides and top.
Screw the front/back legs to the end legs and the box sides with 1-1/4" screws and glue.
With help, or with the table turned on its side, attach the bottom shelf supports and shelf. Cutting small spacer blocks and screwing them to the inside of the legs first, flush with the leg bottoms, gives the shelf something to rest on while you predrill and screw it down — the spacers can stay in place afterward.
Attach the side and end trim pieces to the box with nails and glue, or screws if you don't have a nail gun.
Lay out the tabletop insert pieces on top of the box and trim around them so they have a snug but removable fit — the top trim attaches to the legs and side trim, not directly to the box top.
Sand the tabletop inserts to get a nice snug fit within the trim. Drill a small finger-hole in the center of each insert so they can be lifted back out easily. Fill nail holes, sand every surface, and finish.
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