Gmade BOM ,LiPo info please?

[Gazzalene]

Just building a BOM kit and run into a prob with LiPo.

I decided to run brushed on this first trail/crawler. So bought a brushed 35t motor and HW 1080 esc, with intentions of running 2s packs of 4000mah+  The tray size is 146x34x27tall

I am struggling to find packs to fit that above 2200,2900 out of stock.

I thought I would go with 3s pcks instead but the motor only goes upto 7.4v

Anyone got a BOM who can give LiPo advice, the 2200 and 2900 are both Overlander.