I did it with my Arab mare and my 33" stallion (Amira was 14.2 hh) He could manage OK but when I tried a few years alter with Rabbit- no luck. Without going into too much detail it was not possible- not a lack of "talent" just physically impossible!! Oliver- the result from Amira, was 34" at birth and made 12.2hh at maturity. He was very beautiful- a pale Red Dun like his father, with a blond mane and tail, and you could see the Arab when he moved, sound as a bell and moved like a dream. Harness trained him and he had to be put in with the Horses on the drives as his stride was so long!! HOWEVER- he was definitely a pony, not a horse. When crossing breeds like this the blood tends to fall to the strongest factor in the blood, which, in this case, was Fred's Pony blood, whenever I have crossed Welsh to Arab I have had the most ethereal, Miniature Arabs- you do not get the same result with Minis- also, the height difference is not great either- I have bred the same size using Welsh X Arab. I know you have far more limited resources over there, Pony and Horse breed wise, but, having done it the once, I never did it again, although I have done the Arab X Welsh cross many, many times.