It was easy to solve, but I'm struggling trying to get the design right, also trying to be more robust with the parsing (there are fields that can be interpreted as uint64, int64, int32, uint32, etc).

Most of the hex editors available for linux are broken, ghex for example, the "grab these 4 bytes and interpret them as float32" functionallity doesn't work at all. I don't know what people who work doing this kind of things use.