As an long time gunsmith and shooter, I'll weigh in again reference the Ruger 10/22. For one thing, it's hands down, the best semi auto 22 rifle on the market, also darned accurate for a semi.
Now let's consider customizing. My sincere recommendation, is DON'T start tweaking or customizing your 10/22 or any other good gun until you've put at least 500 or more rounds through it. Shoot the hell out it, get good with it, learn to really love it. Then, if the mood strikes and you have the bucks, customize to your heart's content. Preferably, as much as possible DIY.
When all's said and done, firearms are relatively simple machines. All of them, from single shots to MGs need just four steps to function---load, fire, extract, and eject. With rare exceptions, ultra precise machining is not required. In fact, some built in 'sloppiness' actually aids and smooths out functioning.
I've seen some fine guns ruined---or butchered---by owners too eager and quick to go custom. Shoot it a while first, then you have an experience base with which to decide what to customize and to what extent. Personally, I like custom touches that enhance the accuracy and dependability of the gun. Looks and 'cool' come a distant second. I own and shoot a lot of firearms, both long guns and handguns. I have one old Ruger BH I made custom grips for many years ago. All the other handguns, 20 plus, have the factory grips and sights. I've intentionally taught myself to shoot all of them well regardless of grips, trigger pulls, etc. Sure, I have five or six that are particular favorites but I force myself to take different, not so well-liked guns with me to the range. The only customing I've done on my rifles is perhaps a bit of bedding when needed, a trigger job when really needed, and mounting good scopes on two or three. Otherwise most of my stuff is stock. It's amazing how much triggers and actions will smooth up from shooting. Also how well you adapt yourself to a gun if you keep an open mind and let nature take its course. Just my .02.