Quoted:
I was very careful to follow the measurements exactly. By doing this, will by antenna be properly tunes?
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I'm going to go out on a limb, and say...........maybe. Or maybe not.
How's that for noncommittal?
The SWR is not absolute, and will vary, depending on where you install the antenna. Set it up by the hot water heater in the attic, and you will get one SWR reading. Install it on top of your roof, and you will probably get another. Ideally, you want to install the antenna, measure the SWR, and then make the appropriate adjustments.
So, building it to the proper measurements should get you in the ballpark, but it will probably need some "fine tuning" to get it
exactly tuned up. Often, that can be a PITA, so from a practical standpoint, many people let the antenna tuner (in the rig, or external) do the fine tuning for them.
Or, it may be close enough under many different conditions, that an antenna tuner isn't necessary. The only way to know if it is tuned up for sure, is to measure it.
EDIT: Oh, and good on ya for building your own!!