If you want to build a kit, then by all means do so. The Sig is an excellent flying plane. From what I have seen of the Ibis it should be too. (The engineering of a trainer is not rocket science) If you are really sure you want to build, another choice might be a Telemaster 40 (same size as Sig LT40) or a Senior Telemaster. The Telemasters are tail draggers but find taking a properly built tail dragger off is easier than a trike. They are much more work than the Sig kit though, especially the Senior, but it's much larger.