RE: YAK-54 ARF
Yaron,
As you can in my thread, the extreme flight yak dominant there too.
The new Yak 54 is just like the 140 Katana, you can't compare it to the big Funtana or DPM but it's great for smaller budget who want big model.
It should be a great combo with Saito 150 and for the appearance, a slinline pitts muffler side one or inverted (depend how you mount the engine) will be great looking for that (and sound...)