…the tabernacle can be placed in a side chapel if there is a good pastor reason for so doing, such as to make the chapel available for adoration without opening the whole building etc. …
Harpazo wrote: “I would like to see the tabernacle as soon as I walk in…it’s sad that I can’t.”
According to Pope Benedict in the 2007 Apostolic Exhortation
Sacramentum Caritatis:
“69. In considering the importance of eucharistic reservation and adoration, and reverence for the sacrament of Christ’s sacrifice, the Synod of Bishops also discussed the question of the proper placement of the tabernacle in our churches. (196) The correct positioning of the tabernacle contributes to the recognition of Christ’s real presence in the Blessed Sacrament. Therefore, the place where the eucharistic species are reserved, marked by a sanctuary lamp,
should be readily visible to everyone entering the church. …”. The paragraph ends “In any event, final judgment on these matters belongs to the Diocesan Bishop.”
So I think it is reasonable to write to the bishop drawing his attention to this situation. The 2007 document is recent. The responsibility for the decision on tabernacle’s position is the bishop’s, in a special way.
Certainly there is no requirement to report it to the parish priest first. As it has in the 2004 Instruction Redemptionis Sacramentum:
“[184.] Any Catholic, whether Priest or Deacon or lay member of Christ’s faithful, has the right to lodge a complaint regarding a liturgical abuse to the diocesan Bishop or the competent Ordinary equivalent to him in law, or to the Apostolic See on account of the primacy of the Roman Pontiff.[290] It is fitting, however, insofar as possible, that the report or complaint be submitted first to the diocesan Bishop. This is naturally to be done in truth and charity.”
Regarding a lay person going to the tabernacle, I am not aware of any instruction in the liturgical books, for a normal Mass, that is breached by this. The Code of Canon Law has in canon 938 §5: “The person in charge of a church or oratory is to see to it that the key of the tabernacle in which the blessed Eucharist is reserved, is in maximum safe keeping.” Normally this would mean a priest, but not always.
For the Stational Mass of the Diocesan Bishop, in the Ceremonial of Bishops, n. 165 it has: “Another deacon or one of the concelebrants takes any remaining consecrated particles to the tabernacle, then at a side table cleanses the paten or ciborium over the cup before the cup is cleansed.” (Ceremonial of Bishops, Liturgical Press, 1989, ISBN 0-8146-1818-9, page 60). So it a lay person did it at this Mass it would be breach of the liturgical book, it would be a liturgical abuse. But there is no similar instruction for a normal Mass, in the General Instruction of the Roman Missal.