I do not believe that Coronado ever made a 27 foot topmast sloop, although the term 'topmast' is a bit at odds with the term 'marconi'. Topmasts were usually associated with gaff and gunther rigs.
The Coronado 27's were also later built by Aura/Hughes so you may be able to find literature on the updated version. One word of heads up, many years ago I worked on what I believe was a Coronado 27. This boat had a bolt on cast iron keel and the galvanized iron keel bolts were competely shot. If you have not checked your keelbolts, I strongly suggest that you do. (For what it is worth, I think the 41's were built the same way.)
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Curmudgeon at Large- and rhinestone in the rough, sailing my Farr 11.6 on the Chesapeake Bay and part-time purveyor of marine supplies