That looks like the place where you select components and they assemble it? How much that adds to the cost?
It is fairly easy to put it together yourself. I had my very first PC win95 put together in a shop but started to build it myself for win98 and on. But I never got a gaming pc as I play games like mir2, even mir3d is fine on AIO 27" Asus that I currently use.
Your case has space for full size motherboard (ATX), if you put miniATX, it will look lost in that case, plus you might have limited space sideways for CPU fan. Basically part selection for dimensions is more critical for smaller boards.
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You should look up each part specs, they all give you dimensions like here the limits for the case.
I confess I don't understand that picture of CPU fan height, are the fans these days sitting on the CPU and blow the air sideways or what.
Is that white blob under the fan picture meant to be cooling block? Normally as I knew it, if you see the fan blades like this, the block would be hidden underneath the fan.
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PSU goes underneath into that tunnel? The site has more detailed specs section plus at the bottom a calculator for the PSU where you enter your components to calculate wattage you need
Once you start to study it, you get into it, if some terms puzzle you, google it. In assembly maybe the more critical parts for someone who has never done it is applying the paste on CPU, I think these days clipping the cooling block on the CPU is user friendly. Slotting in RAM modules is another thing to look up, it probably even includes instructions how to press them into the slots (those are numbered, ATX mobo comes with instructions into which slots they go when they come in pairs). The rest is a mechanical job, just some screws and connectors, each connector is custom, can only plug it where it belongs. You will like it more if you assemble it yourself.