Tabernacle is where we put consecrated Eucharist, the central part of a Catholic church. Since when that is St. Peter’s body?
Since when did you think the "tabernacle" Peter spoke of (DR), was anything but his body?
Let's look at a couple of approved Catholic Bibles rather than the archaic language of the Douay Rheims.
2 PETER 1:
RSV St. Ignatius Edition - 13 I think it right, as long as I am in this body, * to arouse you by way of reminder,
14 since I know that the putting off of my body will be soon, as our Lord Jesus Christ showed me.
Nab
13 I think it right, as long as I am in this "tent," (8) to stir you up by a reminder,
14 since I know that I will soon have to put it aside, as indeed our Lord Jesus Christ has shown me.
Note (8) [13] Tent: a biblical image for transitory human life (Isaiah 38:12 <../isaiah/isaiah38.htm>), here combined with a verb that suggests not folding or packing up a tent but its being discarded in death (cf 2 Cor 5:1-4 <../2corinthians/2corinthians5.htm>).
FYI The Eucharist hadn't yet been invented.