I thought the same thing. Not to put so much money on HB FP. It's only a trainer.
But, cannot help my self not to buy upgrades.
Please, someone hit me when I buy something I don't need.
Especially with the Xtreme product. They're so tempting. Moreover when you read review.
I bought a used Lama4 with only front canopy and no landing skid. Now it looks very different. I have KOB canopy, Xtreme landing skid and tail boom.
I also have HBFP. Try to make it simple. I use Xtreme DD tail. Bought a Xtreme 380x but not use yet, waiting for my motor to broke. I really want to upgrade the landing skid with HBK2. It looks so nice. My spare landing skid made of wooden chopstick cover by heat srink tube and carbon fiber rod
If you can't find Slo Max, use Xtreme 380x. The brush can be replace. But, I read that, you have to use Xtreme blade or
modified stock blade, otherwise it will fry your 4in1.