I noticed that you use very high compression level when pack CodeTyphon release. I guess that you need to make as small package as possible in order to reduce bandwidth, but sometimes it takes ages to uncompress it (especial in virtual machines).
Some of us have very fast internet connections, so bigger download package with lesser compression would be much convenient method of delivery for us. I would be happiest if I could get tar archive without any compression, but I know that this is not possible.
Would you please at least think about some alternative compression method? For example 7zip makes smaller archive then zip with less compression.
You could also make "advanced" download package that would not have Lazarus and FPC sources included. The one who want to download that package would be responsible to download appropriate sources from svn himself. So for example I would need Lazarus Rev 37429 and FreePascal Rev 21396 for CT 2.70.
This is not exactly same idea as already proposed idea about modifications as patches (which I think is very good one).