Whether or not he arrived in New France with plans to outshine everyone and everything is debatable (I think that he did). However, the quality of items taken from the palace to pay his debts in 1728 reveals careful taste and, above all, important investment in interior decoration. With respects to mirrors, a profusion of giltwood and ebony frames are mentioned. I have yet to find a comparable period example, but I can only imagine what Dupuy's frame "worked with wreaths and medallions representing the signs of the Zodiac" looked like.
In his two years as intendant, Dupuy’s modifications to the palace décor were extensive. Royal engineer Gaspard-Joseph Chaussegros de Léry had labored to make the 1726 palace fireproof after the series of fires that had consumed its predecessors. Much to his chagrin, documented renovations during Dupuy's tenure as intendant include the replacement of intentionally fireproof plaster cornices and mantelpieces with more fashionable-and flammable- wooden versions. To Dupuy, nothing but wood was considered suitable, and he shared this sentiment with his metropolitan counterparts in Paris. Many of these wooden elements were removed after his recall.
The 1726 floorplan for the new palace, completed in time for Dupuy's arrival from Paris in September of that year, features a Grand Cabinet in the northwest corner overlooking the expansive formal garden. Given the amount of mirror glass that he brought with him, I wonder if he intended to create a cabinet des glaces in this room. Born in 1678, Claude-Thomas Dupuy grew up in an era that celebrated mirrors for their ostentatious decorative qualities, and cabinets des glaces replicated the more celebrated Hall of Mirrors, albeit on a smaller scale. Such mirror-covered rooms existed in Paris and at the château de Meudon, a property owned by Louis XIV's son the Grand dauphin. At Meudon, both the king and the princesse de Conti occupied suites of rooms embellished by the presence of mirrored cabinets that stood at various angles of their apartments.