The worst thing is finding parts for them, I hear that you can get main gears now...the blades are 500mm from what I recall...you can still get those.
Its things like side frames and so on that could be hard to find...some items are easy enough to replace. stock Century itmes for the Hawk will fit the boom...so if a tail unit got trashed its not the end of the world...also things like struts for the skids...there are loads of aftermarket itms that fit ok.
What is handy is to fit a hoop to the skids...I use this a lot...and I have loads of time under my belt. for nose in hovering and landing its a good idea...you only have to make a silly mistake for a skid to catch and the heli can get ruined in a split second.
To make the hoop just use flexible plastic pipe like 15 mm stuff that the plumbing trade uses....aim to make a hoop about the same diameter as the rotor...maybe a touch smaller...then using some canes you can then lash this to the skids...use elastic to actually fasten to the skids themselves...you should get a nice base that slides easily if you get an awkward touchdown...for low hovering about its of great value...certainly saved me from many a prang
Rob