Hi, I created a lightweight Power Pod and Nose for my FT-Arrow.

This Power Pod is wider than the original (56 mm) so it can accommodate larger battery packs.
The only thing you need to change is to trim a bit of foam in the center section to fit well.
I also included a 3D-printed nose to help with impacts ;)

Power Pod supports 16x19 and 16x16 motor mounts (most of quad motors will fit) and weights just 16.3g when printed with PET-G.
Nose weight is 13.8g.

You can also print a bottom plate that helps keeping battery strap in place.

Main section is much bigger than stock and balances great with 3S and 4S batteries:
3S 1300mAh 125g
4S 1000mAh 132g
4S 1300mAh 168g
4S 1800mAh 210g

I'm running DYS SunFun 2207 2750kV and LittleBee 30A ESC (with copper heatsink).
I managed to fly it at max 172km/h (106mph - ground speed of onboard GPS) with 4S 1800mAh setup. I used Gemfan Flash 6042 dual blade prop for setting speed records.
Be aware that above setup pulled over 65A at 4S ;)

I hope you will enjoy this plane as much as I do :)