XY Velocity for a projectile? Solved for

Alright, So last I left off I had coded how to deal with projectiles moving in a strictly horizontal or vertical way. And was waiting on making the code for dealing with both velocities. At first I thought I would have to deal with some type of equation of two variables and solve form both of them using some complex business, but it turns out the method I use is at least 3x simpler than that.
So, first off I use the same method I've been using to get the time interval I should be using in my estimates. since I've described that in previous blogs I won't bother redefining it here. From that I get my hBound variable which is the top of said time interval. From here, I can compute how far the projectile will travel in the time given that it travels at a constant speed of 2.0 units. I then figure out the heading of my turret to aim at so it points at the targets estimated position after hBound time. From here all I need is the vector to give to the projectile as its x movement and y movement. So, using the cos of the gun's theta times the distance of the projectile as the x component and the sin of the guns theta times the distance of the projectile as the y component, I make up my vector. From this I have a triangle that may or may not overshoot the position if fired at the wrong time. So how do I figure my delay time out?

Simple, I take the magnitude of that vector I just made and divide by hBound to get how many units of time it will take to traverse this hypotenuse I've created. If that number is equal to the time it takes for the projectile to get to the estimated position then hoorah fire right away, weapons free, danger close. If its less than that then set up delay which is as simple as Time of the target - Time of the projectile. And the other situation, where T(proj) > T(target) never occurs because that would violate the work above with the whole hBound thing, theres a reason it's called the hBound you know. From here things get pretty simple.

since I have my heading, my delay time (if there is one) all that is left to do is to fire. Which is done by created  anew object that has the position of the turret, the velocity vector is the heading vector of the turret(which has been normalized) multiplied by the velocitiy I know the projectile will travel (2.0 units), ahem. Tah-dah.

Now of course is where I fork myself, should I proceed to trying to create a 3d version of this? Or should I build up a simple library in DirectX to actually see whats going on instead of just numbers? Hmmm.