Eddie, you always ask the best questions and have the best answers.
I wanted to build my own sprayer, but when I figured it all out I was only about $50 off buying new. I am not happy with 25 gallons at the moment, but in the long run it will be better to have than the 50 gallon. I think there are higher quality sprayers than the fimco but it was not worth the $ to me as well.
There are a bunch of downsides to having the sprayer out front. Yes, you drive over the chemicals, although I bet you probably do with a rear sprayer when you back up. I wear a respirator. No way around that one. You bring up a good point on what happens to the tires. Never thought of that. And you do "track" chemicals all over... I guess I could drive backwards.
I palletized the sprayer so it just goes on the forks. Did not secure it to the forks and dumped it first time out. Next stupid thing I did is that you don't want it too high (sprayer from the ground) but because this is the slope tractor I go wherever I want. Coming down off a steep slope and into a flat area dug the forks into the ground and, well, damage ensued.
I am not fond of the wand that comes with the sprayer. What I dislike is that when you do a straight stream (I am killing large blackberry meadows) it puts out a lot of fluid. I wish I could get a spray wand that kept the pressure / distance up but did not put out the volume of chemicals.
In putting the sprayer out front it took some thinking time to make sure the booms would fold back without colliding with the front tires.
But there are some serious advantages. I see exactly where I am spraying. I have what I consider fantastic control over all elements. I see the pressure guage, see my spray pattern and know where I am going. I like to keep the wand in the cab with me, and spot spray as I am boom spraying.
I wired the hole system up to a dash switch. Seem to work out quite well.
Any other questions? Happy to answer them...