Now that is a specific question.

I am in Vancouver, used to live on Bowen for many years. We built all of our own docks/floats on Topper floats, with rocking, or tilt ramps. Great way to spend a summer.

All the commercial construction that I have seen locally violates your 'cheap' rule. Companies like BC Pile Driving, etc.

I would look for a small company in the Gulf Islands. I can't find the link to the one I saw the work of (I think he was on Gabriola), but you could look into Viable Marine on Saturna, or Island Marine on Saltspring.

Complete float kits are available from Enviro Float in Victoria, and you could always contact Topper.

Use all of the above at your own risk. My experience is all with amateur built (and they are all still standing).

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2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue