Just for your info I just bought a TOC Yak 54 from Chief Aircraft, together with a DA50cc.

Engine installed easily and awaiting some servos to complete it. Looks good so far but it did not have a construction manual to work with. One can download a manual but not a whole lot of readable info in it.

I earlier this year flew a QQ 72" Yak 54 and was absolutely in love with it but due to a brand new heavy duty switch failing, it crashed.
This aircraft holds a lot of promise and may prove superior to anything we have flown so far.
That Lanier Yak should be a great model as well. Being the same wingspan it should be IMAA legal just like the rest of them.

3dbob