Got to give it a try. I hope some others come up with more stuff.
1.- Is harder the further we go back in time. I think we would have to review how often life restarted from scratch or near scratch, and then evaluate how it ended and restarted, and what living organism made it through. Remembering that a lack of explanation for the restart in itself is not proof of a designer. I has much to do with: how often was there a restart, how did it happen, what life forms remained. Fossile research is of great help in this regard. I do not think the designer to be perfect though, but that again, is an assumption.
2. "No systems designer adds stuff to make it more beautiful." Maybe this does not deserve a place on this list.
The next 2 will be hard to prove, but are valid points if confirmed.
5. "non-related" in this context means: it could not be passed on in the process of natural selection. There should no connection in the "tree of evolution" if you wish.
6. "There would be certain barriers between life forms that cannot be broken. e.g.: Plants live on carbondioxide and sunlight. animals need oxygen to live. There does not exist an animal that lives on carbon dioxide instead of oxygen, as far as I know.".... " . . is this feature exclusive to design?"
I believe so, because natural selection does not have any of these barriers. Ultimately the species that survives, is the best adapted one, according to natural selection. In the example, there is no reason why an animal species should not use carbon dioxide, there always was enough of it available. A designer chooses options, thereby ruling out others. More research is needed to establish it though.
7. - there should be repetitive processes in the development of life, a kind of design software if you like.
"The guiding parameters must be examined for evidence of design rather than the life that results. We must answer this question first before drawing any conclusion from the other."
I fully agree with you on that one.
8. - there should exist unique building blocks which can be torn down, but which can never be replaced or rebuilt from scratch. E.G the ozone layer or the ionosphere.
The atmosphere in itself is not a valid argument for design. Many other planets also have an atmosphere. The question is rather, what parts are of our atmosphere are unique , and if so, how did it come in existance? Could it be designed or was it a lucky concidence (natural selection does not come into play for the atmosphere)
Testing for design is not an easy exercise unless the features of design that we identify can be attributed exclusively to design . . . ie; there can be no other explanation. A design feature of this nature, is tremendously difficult to identify and isolate in itself. Hence the inconclusive nature of the whole debate. I could not agree more. And it is a nice and big challenge.