Pretty much echo what they said...
I built my first boat on a very limited budget. It did take me a very long time and i dont even have the foggiest idea of how much money.
When i would get frustrated, or discouraged. Take a few weeks off from it, maybe a month or two.
Hell my first rogers sat for about 6 months before i even started on it. (never completed it, and sold it)
A build thread is a GREAT idea. Heres a link to mine
http://www.socaljetboats.com/projects/1970-weiman/Couple of words of advice
Budget - Yeah.... i completely understand having a budget, but also just accept the fact you will probably bust through it.
I have about 3k in my fuel system because of a loose wire.
You will have a LOT of fun doing the build, and time with your son is what matters the most. My dad and I built mine with me footing the bill, well most of it.
There are a lot of very nice boats on here. And lots of very nice people. I've accepted the fact i personally dont have the budget to have my boat as nice as theirs, so i chose what I wanted out of it and did that. I have something different that is fairly quick.
One thing i did, that i will not do again. Is i went in WAY over my head. When my first engine let go, it was all holds barred. I dropped every last dime i could just to get the boat back together. (hence the 3k fuel system)
And double check everything. The fuel system was my fault and was a loose ignition switch terminal dOh!
But of all things... Have fun, cherish the time with your son and itll be worth it some day. Maybe this season, maybe next. I'll never forget the nights/weekends wrenching on mine with my dad til 1-2am. The beer drinking and the joking/ball busting. Memories i hope to make wiht my own son some day