Always good to see people wanting to make something on their own, great to keep the mind busy.
I'll just give you some of my personal opinions on your project. First I'd wait till I had all the parts in hand that I was going to use. Scope included. This will answer your questions about how tall the base should be and how long. For my builds I prefer the base to take up most of the height and use the shortest rings possable. Height is height and you need to get it somewhere and the base will be the strongest place to do that. On the base, their is no advantage running it out beyond the receiver, actually stop short to give it plenty of clearance in the lug area. Now you can run the top of the base extended above the nut if you like, but that will depend on your scope length and how much room you have to work with when you have a location for your eye relief. Even using a Nightforce with 3 to 4 inches of eye relief on a short action will not allow you to run much of an extention on the front without running into the scope. Might look for a scope that will have a straight tube and no objective bell may better serve your purpose if you insist running an extention beyond the base. Recoil lug is a great idea and they do work. Just catching the top front of the ejection port will do just fine. For adjustment and to make it easy just use a large set screw like Ken Farrell does. Don't worry about the angle being perfect because you can correct it with the angle you put on the set screw. You might want to install larger base screws also while your at it.
Hope this helps you in some way and good luck with your project.
Later, Brad
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