Fr. Komonchak, a Vatican II historian, has translated on July 27, 2013, the eleven chapters of the draft De Ecclesia elaborated by the preparatory Theological Commission for Vatican II. (source)

It's very interesting because it
• has copious, well-docuмented footnotes
• frequently uses the term "Church Militant"
• Ch. 2 begins with an excellent statement of extra Ecclesiam nulla salus: "The Holy Synod teaches, as God's Holy Church has always taught, that the Church is necessary for salvation and that no one can be saved who, knowing that the Catholic Church was founded by God through Jesus Christ, nevertheless refuses to enter her or to persevere in her."
• Ch. 10 is unambiguous; its subheading reads: "The Principle: The Distinction between Church and Civil Society, and the Subordination of the Purpose of the State to the Purpose of the Church."
• supports the statement "No civil community, therefore, should consider that it can legitimately oppose the fulfilment of this mission divinely entrusted to the Church for the whole world." by citing Franzelin et al. (fn. 6, p. 56)
• has a neat footnote (#6, p. 64) that describes, in the context of ecuмenism ("Christian unity"), the historical usage of the word "Church" as applied to non-Catholic groups ("particular churches")

http://www.paxbook.com/algorithmiS/servusPrimus?iussum=inCorbem&numerus=22310

Acta et docuмenta Conc.Oecuм.Vat.II apparando s.II v.III pars I (Praeparatoria ). Acta Commissionum et Secretariatum Praeparatorium Concilii Oecuмenici Vaticani II.

That appears to be only the Praeparatoria volume. There are 23 volumes in total, spanning 31 cm. You can find it in a library near you by visiting its WorldCat page.