You might be better off starting with the two 990 PCF files I'm hosting
here . The 1050, 1070/970, and 990 all use similar remotes, but the 1070/970 and the 990 use the
same version of that remote - the only difference as I understand it is the key mapping (the "menu" button on the 990 is the same as the "sync" button on the 1070/970, for example), so you could shuffle some things around if that is easier.
If you get a PCF file together, you can e-mail it to me and I'll add it to the collection.