HO Scale

Straight

19 1/4" wide

20" deep

2 3/4" High

Straight Double deep

19 1/4" wide

28" deep

2 3/4" High

Track for both Straights are the same and you will need

4 pcs Kato #2-150 (246 mm, 9 3/4")

Corner

28" wide

28" Deep

2 3/4" High

Track for HO corner

Inside 4 ea Kato #2-210 (550 mm 21 6/8" R)

Outside 4 ea Kato 2-220 (610mm 24" R)

http://www.t-trak.org/holayout.html

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HO outside track must be 3 1/4" from edge

HO Inside track must be 5 5/8" from edge

Track must overhang by 1/32"

To build HO boxes you will need

4 ea 1-1/2" sq X 2" L Blocks with a 5/16" hole drilled in the center lengthwise all the way through

4 sides for HO scale straight  2 at 19 1/2" by 2-1/2" and 2 at 19 1/4" by 2 1/2"

(note for double deep change the 19 1/2" to 27 1/2")

4 sides for HO scale corner 2 at 28" by 2 1/2" and 2 at 27 1/2" by 2 1/2"

Using 1/4" plywood for the sides and the top

4 ea  1/4" - 20 T nut

4 ea 1/4" -20 X2" Carriage Bolt

Also some small blocks of wood for support.  4 blocks for each side or even a long board to go across the full length especially on corners

N Scale http://www.t-trak.org/easyintro.html

Straight

12 1/8" wide

8 1/4" deep

2 3/4" high

Straight Double deep

12 1/8" wide

14 3/8" deep

2 3/4" high

Track for Straight

2 Each #20-000 (9 3/4" straight)

2 Each #20-040 (2 7/16" straight)

Corner

14 3/8" wide

14 3/8" deep

2 3/4" high

Track for Corner

inside 2 ea #20-110 (11" r)

Outside 2 ea #20-120 (12 3/8" r)