water cooling components

With all dues respect towards people who are adamant at watercooling, there is a point where you can cut corners in your budget and yet experience fantastic temperatures. The only issue with cutting corners is that you need to understand why you're cutting them and how you're going to be affected by it. Please bear with me while I try pointing out some of your choices in your list.

The GPU blocks' information page states:

Bykski A-R290X-X VGA water cooling block designed for public version of the Radeon R9 290X R9 290 graphics card. please confirm the model of your vga card to ensure the compatibility.

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which leads me to ask which variant of an R9 290X do you have as there are a lot of brands offering said card and even more so when you factor in each makers SKU's and non reference PCB designs. Have you confirmed the blocks compatibility with the block's manufacturer? It's not stated in the information section apart from the above quoted message.

The cpu block seems like a Bitspower/EK hybrid knock off but what concerns me is the mounting mechanism for the block since block pressure and optimal thermal paste spreading can help in achieving better temps overall which leads me to the next inquiry, what about it's back plate? Is it compatible with you motherboard since there can and, at most times, will be a component at the back of the motherboard around the CPU socket that is necessary for your systems optimal operation.If you're on an LGA775 and LGA1156 motherboard's this will be very coherent.

The res has nothing to be concerned about, it's only a vessel that can contain your loops fluid inside. Just make sure the res' height isn't conflicting with your cases internals/externals.

Your pump looks somewhat like an Eheim pump or more so a pump meant for garden fountains. Regardless just be aware that you can't regulate the speed of the pump even though it has an RPM sense wire. Another point will be if the pump has G1/4 threading to accept your fittings.

The rad you've chosen could be a (major)concern as it's a slim profile radiator. This means you'll need high static, high rpm fans to get you desirable delta T's on your loop otherwise it's only costing you money to build it without any functional value.

The fittings you've chosen is 3/8"ID 5/8"OD while your tubing is 3/8"ID 1/2"OD which isn't going to get you anywhere. You should either opt for buying fittings that correspond with your tubing dia or you can swap out the tubing to correspond with your fittings dia. That being said, the minimum dia for a loop with pretty much a DDC/D5 pump should be 3/8". You'll also need 10 fittings in total.

With all that said, why are you going through all this hassle when you simply pick up an AIO yet expandable watercooling kit like an EK Predator QDC version kit and add an R9290x block to the mix? You come to 249USD(excluding shipping and taxes) with all the parts chosen, why not just go for CPU only loop now with an EK/XSPC/Swiftech kit and then add block in later after saving some money? You're going to net better temps that way and the venture to watercooling worthwhile.