BoatWoodwork has pre-manufactured teak and poly swim platforms (swim steps).  If you need custom built items visit Woodworking for Watercraft.

Solid Teak Swim Platforms and White Poly Swim Platforms by AFI

From 18" to 90"

#60900 18" Outboard Teak Swim Platform with Mounting Hardware

$90.50

#60901 18" Teak Swim Platform Kit for Boats with Inboard/Outboard (I/O) Motors

$96.39

#60902 - 18" Outboard Teak Swim Platform with Mounting Hardware

$132.44

#60903 - 18" Outboard Teak Swim Platform with Mounting Hardware

$133.76

#60918 - 18" Teak Swim Platform

$72.00

#60924 - 24" Teak Swim Platform

$124.00

#60972 - 72" Teak Swim Platform

$416.98

#60980 - 80" Teak Swim Platform

$468.26

#60990 - 90" Teak Swim Platform

$564.32

Custom Built Teak Swim Platform

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#67900 - White Poly Swim Platform Kit for Boats with Outboard Motors

$90.15

#67901 - White Poly Swim Platform Kit for Boats with Inboard/Outboard Motors

$90.15

#65972 - 72" White Polypropylene Swim Platform 

$612.47

#65984 - 84" White Polypropylene Swim Platform

$747.20