Building a mini game console/media system

[ThinkPad560X]

I am thinking of putting my desktops away, Not selling, but put away as I am done buying PCs and collecting them. Any PCs I have and if need the newest hardware then I will upgrade said PC and not buy any. I have many desktops ranging from tall towers to mid to mini and micro. All DELL, IBM/Lenovo and then my small Apple collection. Same for laptops. All ThinkPads from IBM/Lenovo and 3 Apple laptops. Right now making it less clutter and will fit in the living room with my PS5 or XBOX Series X depending on what is out. I have the Dell Inspiron Zino HD 400. It is a nice little compact Mini ITX PC from 2009. It is maxed with ram at 8GB DDR2, 2 x4 laptop ram. Not sure if it can handle 16GB but 8GB stick would be hard to find along with the high price just to test and figure out. Has a AMD Athlon II x2 1.80GHz supposedly can handle X3 or even X4. And then a built in AMD Radeon 3200 HD 256MB. 2TB HDD 3.5. I can play fallout 3 and New Vegas on it but with light lag. Probably the GPU. From what I seen the Dell Zino 410 and a swapable PGU like seen in a gaming laptop but the board is $70 and the GPU is $30+ I don't think there is a way to add a GPU to this other then through the built in WiFi slot. https://www.amazon.com/Mini-PCIe-Adapte ... 0299&psc=1

But I was thinking it would be better to just swap the board out for a Mini ITX board but not sure if they will fit and I would need a PSU 24pin or 24pin to barrel. I can make a custom I/O backplate as it is a plastic backplate.