YES!
Found it.
That last error made me include a "-d64" flag into the SweetHome3D.sh file. That, on its turn, yields the following new error:
Code:
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options used: -d64 -Djava.library.path=/usr/lib64:/usr/lib
arguments used:
Error: This Java instance does not support a 64-bit JVM.
Please install the desired version.
I removed the flag from the file, looked into yast, and finally saw the DEVEL package from sun java 1.6. Then, I removed the old java link created above, and installed that! Voi-lá! It's working!