I’m going to second Evan on this.
Sure it might be possible, but buying a board (even if it’s a DIY board) I would recommend if you don’t want to learn to solder.
Check out Skyart and Defiant Board Society, among countless others… or the boards listed here in the parts market.
If you’re trying to save cash, DIY is not for you.
DIY isn’t cheaper.
buying a used DIY could be, sometimes
hm why, what am I missing
I’m using pretty cheap parts
Just want to let you guys know
I’m building this board for a challenge, I want to make a cheap plug-and-play mountain board.
That is why some of my parts are cheaper and I want to go for the easiest way to build the board
Does the challenge require a mountain board or building one?
its a bit of both, I want to prove you can go another route then trampas or shitty Chinese boards
there are other routes.
Ye but nearly 3k for the complete setup, I want to be able to hit the tracks without getting a second mortgage
You could always try to ask someone like @Skyart to do the drivetrain and esc portion for you. Or you’ll have to order from someone soldered adapters. Or you’ll have to send parts to someone who will solder stuff for you.
If you want to do DIY because you think it’s cheaper, you will be very disappointed.
Where are you located dude?
I have a bunch of used Emtb parts that you could consider for the build.
And if it is cheaper it is likely to be slower and worse.
Dont know where you are located but there is a guy selling his mtb in hungary for half the price of your budget.
If you dont want to learn how to solder you might aswell quit on every electronics project ever. Or you have to crimp and bolt everything 
Mountainboards are primarily used as a fun outdoor activity. To have fun, you want the board to not break constantly, and have the power needed to actually hit outdoor trails.
The Apex predator ticks those boxes, and the value you get for that price destroys everything else. I’ve built my own Mountainboard, and even I wish I just bought a complete from Apex instead.
If you can’t afford it, I suggest putting your effort into earning more. 
If You would like to save money, buy something from second hand. First DIY build is Mostly try/mistake. Lot of small things I bought and finaly not used . And if You would like to build board and save a money, You definitly need to know more than soldering. I saved some money in my build but because I build batterie by my self from reclaimed batteries for 30% price for cells. Next I designed my Vesc case and motormouth and sell some copies of it which gave me some money back. Wish You a success.
Don’t let the soldering aspect discourage you. It’s a vital skill to have for esk8, and as others said, not too difficult to get your head around. Definitely look at that guide! But yeah, DIY isn’t going to be cheaper. You can save money by learning to build batteries(not at first but eventually). But for most, it’s not worth the headache and potentially building something unsafe the first time around. The beauty of DIY is building your board exactly how you want, the ability to make improvements, and learn more
Learning to build batteries (and solder very well, by extension) is only cheaper after you mess up two and then build five more… then you start getting to the “cheaper” phase.
@esk8_01 check this out. This gets you in the game without soldering and with a badass machine.