This is a hypothetical design for either a small parish church or a large chapel designed in a hybrid Tudor/Gothic style. A peculiarity of English Gothic architecture is the use of
hammerbeam roofs with their interconnected arches and shaping of vertical space. The particular ceiling used for inspiration here comes from the great hall of the grand English manor house Wollaton Hall.
As for the liturgical elements of the chapel, I decided on a relatively restrained interpretation of the Gothic, which was common in the British Isles during the Medieval period. The sanctuary is traditionally arranged with a large freestanding altar at the center; the tabernacle, crucifix, and accompanying candlesticks immediately behind the altar; the ambo on the Gospel side of the sanctuary; a smaller lectern on the Epistle side of the sanctuary; and the sedilia (seating for the priest and altar servers) on the Epistle side, facing perpendicular to the nave.
I have discussed here numerous times as to why it is symbolically important to keep the altar, the crucifix, and the tabernacle grouped together (though it is not mandated specifically, and there are other noble options if the arrangement is not practical), however, the placement of other furnishings in the sanctuary is also symbolically derived. Many of the earliest Christian churches had their altars located in the east end of the structure, since east is the direction of the rising sun, and worship toward the east speaks to Christian belief about the resurrection and rising with Christ. Given the altar in the east, the presider would often sit along the south wall in the sanctuary, so that he was facing north. In the early Christian world, south represented the Christianized Roman Empire, while north was filled with heathen barbarians. Thus, the priest would preach from "the Church" to the non-Christians. Additionally, the Gospel was often read from an ambo (pulpit) on the north side of the sanctuary. The Gospel must be spread by those who already believe to those who do not believe.
Having the priest and the altar servers face perpendicular to the nave also serves another purpose - it keeps them from being the center of attention. Often in modern churches, the priest's chair is situated so that he is always facing toward the people when seated. This can detract from the true meaning of the celebration of the mass. If the priest is not directly facing the people he becomes less of an attraction unto himself.
I have thus explained myself. I must say that I am very happy with how this drawing turned out, and count it among my favorite hypothetical designs. As always, click the photo to view larger.