www.oneoceankayaks.com has a listing of western red cedar strip suppliers.

There is also an Australian timber - Kiri - which is about 25% lighter than
red cedar - www.highpointtimbers.com.au

IMHO its better to saw and rout the strips yourself - you can make strips of
variable widths 3/8" through to 1 1/2". You really do need the narrow strips
for the compound curves - 1" strips just do not bend enough.

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