"Whatever may be the design of a church, the area for the people is designated as the 'nave'.  The seats for the people should be so arranged that the people can participate easily in worship by being able to see the altar, lectern and chair, and that they should be able to come to Communion conveniently." - Para. 45, Ceremonies of the Modern Roman Rite.

295. The sanctuary is the place where the altar stands, where the word of God is proclaimed, and where the priest, the deacon, and the other ministers exercise their offices. It should suitably be marked off from the body of the church either by its being somewhat elevated or by a particular structure and ornamentation. It should, however, be large enough to allow the Eucharist to be celebrated properly and easily seen.

296. The altar on which the Sacrifice of the Cross is made present under sacramental signs is also the table of the Lord to which the People of God is called together to participate in the Mass, as well as the centre of the thanksgiving that is accomplished through the Eucharist.

304. Out of reverence for the celebration of the memorial of the Lord and for the banquet in which the Body and Blood of the Lord are offered on an altar where this memorial is celebrated, there should be at least one white cloth, its shape, size, and decoration in keeping with the altar's design.

305. Moderation should be observed in the decoration of the altar.

307. The candles, which are required at every liturgical service out of reverence and on account of the festiveness of the celebration (cf. above, no. 117), are to be appropriately placed either on or around the altar in a way suited to the design of the altar and the sanctuary so that the whole may be well balanced and not interfere with the faithful's clear view of what takes place at the altar or what is placed on it.

308. There is also to be a cross, with the figure of Christ crucified upon it, either on the altar or near it, where it is clearly visible to the assembled congregation. It is appropriate that such a cross, which calls to mind for the faithful the saving Passion of the Lord, remain near the altar even outside of liturgical celebrations.

309. The dignity of the word of God requires that the church have a place that is suitable for the proclamation of the word and toward which the attention of the whole congregation of the faithful naturally turns during the Liturgy of the Word.

310. The chair of the priest celebrant must signify his office of presiding over the gathering and of directing the prayer. Thus the best place for the chair is in a position facing the people at the head of the sanctuary...Any appearance of a throne, however, is to be avoided.

313. The organ and other lawfully approved musical instruments are to be placed in an appropriate place so that they can sustain the singing of both the choir and the congregation and be heard with ease by all if they are played alone.

314. In accordance with the structure of each church and legitimate local customs, the Most Blessed Sacrament should be reserved in a tabernacle in a part of the church that is truly noble, prominent, readily visible, beautifully decorated, and suitable for prayer.

316. In accordance with traditional custom, near the tabernacle a special lamp, fuelled by oil or wax, should be kept alight to indicate and honour the presence of Christ.

"While not strictly part of the liturgical setting, the sacristy plays an important role in preparations for worship and its worthy accomplishment."-  Para. 79, Ceremonies of the Modern Roman Rite.