Your not wrong. it would also make it slimmer. additionally
additionally if I make my battery like this ^ the "lid I plan on using will be to narrow, so the lip that will over hang the battery will make up for width.
My other idea is to buy ABS rods .5 x 1.5 x 36inches and make the frame out of that or maybe some 2x1wood (1.5x.75 actual size)
what do you think of this (DYNAFORM U Channel, ISOFR, 9/16 Leg, 1/8 In Th, 10 Ft - 4ATN1|870790 - Grainger) instead of the aluminum?
The 2inch width seems a bit overkill but its a decent material. Half as stiff as aluminum, nonconductive (good around batteries), but can’t really hold threads reliably (you would need to incorporate nuts if you’re gonna attach them with screws)
2 inches was the smallest size. but now I’m thinking maybe I should double stack my batterers
So, the new 6 series flips are fakes? They are really 4 series?
I chose the 6 BIG flipsky as I didnt even trust the 6 plus.
Anecdotally, my huge vesc has served admirably.
Yes, I would do that except consider putting 6 up front and 4 in the back, depending.
What enclosure do you have?
oops, my bad.
which one would you suggest?
I recommend to
A) Use a deck that has an enclosure commercially available
or
I wouldn’t try anything else, but your results may vary.
its too late for that
Maybe one day when I have the time. probably not in the next few months, probably at least 6 months.
With all due respect, the quality of your battery and enclosure are the two most important things.
Have you considered using a different deck that has an enclosure available?
Do you think that I’ve been in your exact position before?
Another question, I have access to a cnc machine and was thinking about carving a thin rectangle out of the bottom of the board to make everything nice and flat, plus get a few more mm of clearance. would this be a bad idea?
I don’t know what to answer. I am assuming the answer is yes and you are trying to help me learn from your past mistake, but on the other hand it is very possible that you had the forethought not to make such a mistake.
Yes, this is what we do around here 
This depends a lot on the deck and your weight but many folks do it.
You can route out a lot if you cover the bottom in a layer of fiberglass afterward.
If it’s not much, you’re not heavy, and the deck is already super stiff, it might be okay. There are a lot of variables.
How much does the deck flex if you jump in the middle?
so I just took a slo-mo video of me jumping on the middle of my deck and it was surprising more flexible then I thought
The battery isn’t going to appreciate that.
I plan on making my battery flexible and with the enclosures added stiffness, do you think it will be fine?
I have an enclosure if your interested, it’s abs. DM me if your interested and I’ll give you the dims of it to see if it will fit.
ABS enclosures work really well if you put fiberglass tape around the boltholes or use an aluminum bar or something as a multi-bolt washer.