First off Welcome!
You have built one fine machine there and it looks like a real dream. I have a 16' lowe that I am modding up. You have done some things that I was planning on doing also. One of my questions it what kind of lights are on the front rails? Are they 12v? How bright are they?
I really like your overall layout. I already added a front deck to mine, but for bass fishing, and I was planing on building a removable shooting deck. One thing that I am wanting to do is build a raised floor between my rear seat and my extended front casting deck, and then I want to put my center console on it. I have been thinking about adding some pontoons like yours in the back. I don't really think I need them, but I guess they couldn't hurt. I too have very little in my boat money wise. I got the hull for $150 and built a trailer out of a salvage trailer. I was given a motor and then traded it for a different one. I don't think I have even $500 in mine yet. We do boat repairs and a dealer around here owed us some money, so we picked up a bunch of used trolling motors from them and I built 2 complete units from three identical units. And fixed a bad switch on another and I have 3 complete running TM's. I think I bought a $12 part for one of the motors.
We are almost neighbors, (only about 1-1.5 hrs away) Maybe one day we can meet up and go do some fishing in our boats.