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Thanks for your request. Memory usage depends on document size, format and document’s content. Usually Aspose.Words needs few times more memory than document size to build model of the document in memory.
Also, I would like to say that producing huge MS Word documents is not very good practice. MS Word does not like huge documents. Usually it takes a lot of time to open such documents in MS Word and sometimes MS Word just hangs. Normal size of MS Word documents is 100 – 200 pages. So I suggest you just generate few small documents instead of one huge document.
Regarding AppendText, this is impossible. MS Word documents are not just TXT files they have complex structure and it is impossible just to write to the end of the file.