if you want a front hinged flipper, go for something like what king mushroom made:
anyway, general advice time:
dont use piglets for drive, use 2wd npcs with hypno wheels. piglets are weapon motors and lack the torque for drive.
use ant batteries instead, they weight a lot less, take up less room and will power 1 motor each (provided they aren't burst motors, bsg's take 2.5 ants each, small jx's need 5, large ones need 7 and betas need 21. you dont need to worry about the rest until later)
the larger control board is actually lighter, it's a good habit to use it instead of the small one unless you cant fit one in.
metal hinges and wedge pieces (in the extras) will make getting robots onto your bot a lot easier. you can also use skirts if you need weight.
it's generally best to build a chassis around the components, having it as small as it will go. you will often see a bot with a small 2x1 chassis in dsl because they allow more weight for weapons.
spike strips have something called normals, which means they only deal damage on one side. weapons without normals are nearly always better so try to use them a bit more. unless using certain weapons makes your bot a lot cooler or you just want them for armour.
try and built to the weight limit, a 300kg will almost always lose to a 400kg bot (well, the closest to the mw limit) as they will have less armour, weapons or drive.
the best armours are most of the plastics and titaniums.
atleast your splashes are quite nice. may i ask again what showcases you liked the look of? just to determine if you are better off building irl or standard dsl.
edit: it seems i got beaten by everyone and my pics wont work. here's a link anyway:
https://gametechmods.com/uploads/images/13914screenshot_13.pngand read some tips on the wiki, they will help quite a lot. and download nar ai, maybe an earlier version.