Hooben is slow, they have to print your parts that you want. Your lucky they are selling you parts to begin with since you dont have the tank.
I love my merkava, but I have had to work on it more than any other tank I have, and most of my tanks I built myself on top of a marketed chassis, taigen Tamiya henglong etc. The merkava has been mostly all mechanical repairs, some cosmetic but not alot.
I sort of expect the same with my coming Leopard 1a5 but we will see. It does not have the fancy control arms the merkava has.
But I got to say, Hooben worked with me alot and had good communication through facebook the whole time I was having broken arms on the merk. They agreed to my terms for a solution which was not any kind of refund.
I am hoping that the Leopard 1 will be a better mechaincal tank, hopefully they mostly copied the tamiya. Which I am building three more of right now lol