I think the 100 would really struggle with this plane. I had the 100 in my UCD and it weighed 7lbs 4ozs. It flew it fine but maybe still just a little bit underpowered although I must say, not bad. But this plane with a Saito 100 would still weigh 8.5 lbs. I think that would just be too much weight. I'd go with the Saito 120. That would work fine.
Thanks,
Barry