WaffleJaw,
In front of your cup holder you should have a rectangular area designed for adding accessories such as depth finders/rod holders etc. This area is pretty easy to access from your front hatch.
http://www.scotty.com/fishing-gear-equipment/rod-holders/powerlock.You could add a simple Scotty rod base there. I'm using them on my boats and yaks. IMO they are inexpensive, versatile & durable
You might consider bonding an angled piece of, primed & painted treated wood to make that area flat 1st.
If you dont youll end up with this...
This will work but it a lil low and not at the right angle to work the way it was designed.
So once you get your angle right, drill your 4 holes through your scotty base, wood & hull, then add some stainless hardware. Think I used 4 stainless bolts/4 stainless washers/4 stainless Teflon lock nuts/4 rubber washers. IMPORTANT!!! Don't forget to reinforce the inside of your yak behind the plastic. IMO this is your week point or stress point.
Use marine goop or 100% clear silicone to make it all watertight between everything. wait for it to dry before you trim the silicone with an exact-o or razor blade and your ready to row!
The whole project should run you about $25-$40 & be completed within 1 day depending on how much you already have on hand.
Later you can add a triple rod holder like i did but for now a single rod holder will get it done. If you add holders later to the sides tracks you could move your sonar unit to the center scotty base. Scotty's sonar mounts:
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