That same Lipo Tray is in every single 6s Arrma. It is the second revision that has carried over for many years now.
What don't you like about it?
That front lifting piece bracket can be removed, if your lipos are too tall for it.
HR made an alloy replacement lipo tray, but has since been discontinued. Maybe you can find one floating around. IDK. I believe when this current 6s Arrma Lipo tray was revised to what it is now.
You can get creative, and make your own lipo tray, like the speed runners do with their custom chassis builds.
BTW, Most, including myself, will move the Lipo tray
Rearward for better chassis balance and
less nose diving. The holes are there already on the XLWB Mojo chassis. Only for dedicated speed running would I recommend leaving the lipo tray in the stock Forward position. To keep the nose planted at high speeds. For off road and jumping, the Rear position is best. I find the Mojo loves to nose dive out the box, in its stock form.
I also installed a front windshield. To reduce some of that inherent drag from the Mojo body.
Food for thought.
