Bike port

A little rusty at this.
Steve

rumble.com/v6qj46q-started-framing.html

It's gonna be what it's going to be. 
Steve

rumble.com/v6qjtfm-im-just-going-to-do-it.html

I missed it.
Steve
rumble.com/v6qky5u-i-fked-up.html

Not much material needed. 
Steve

rumble.com/v6qm4lo-started-on-the-underlayment.html

You gave me an idea.I think i will try to do this in my small garage that has gravel on floor.

Where I live is a dry climate (desert). The plywood will last a long time. I double it up for a thicker floor and for screwing the staggered pieces together. In your case I suspect the gravel is to allow someplace for the moisture to go. If that's the case I'd use copper sulfate to treat one side to stop dry rot. I had a gallon around here for fence posts but I left it on another job so I can't use it anymore. It's a good thing to have around. It is also used to keep roots from getting into drain pipes. It can be bought as a root killer for waste pipes. When I repair one I pour some in the hole then fill it with water. Once the water is gone I bury it. It's nasty stuff so don't get any on ya. 
Steve 

Trying to save this thing
Steve
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Making adjustments
Steve

rumble.com/v6qsq8c-renailing-the-plates.html

Fitting the pieces together.
Steve

rumble.com/v6qta3y-filling-in.html

Making some headway
Steve

rumble.com/v6quh9i-started-on-the-floor.html