The second major portion of the work took place in the apse which was manufactured in three giant 2.4 metre sections. Models for the ribs were run on the apse mould in the workshop and then cast off to make five moulds of diminishing sizes. Four types of rosette, diminishing in size, were cast in plaster before being installed into each coffer on the Apse. Another decorative feature was a flute mould that was installed to the top band of the apse. An anthemion model, again to the architect's design, was carved in timber, poured in rubber and cast in plaster plates before being installed in the top of the apse.

Plastering of the walls between each of the columns was carried out using a natural hydraulic lime plaster applied in three coats. This was an extraordinarily demanding job that involved a high degree of precision and knowledge. The sheer scale of the various aspects manufactured in house gave it the appearance of a large jigsaw. All of the pieces slotted together perfectly and the result is a stunning brand new chapel that retains a host of historic, ornate and decorative traits.

The external lime harling was applied using natural hydraulic lime (NHL3.5) mixed 1 part lime to 2 part sand for the scratch coat and 1 to 2.5 parts for second coat. For the final coat, the harling/wet dash consisted of a mixture of 1 part lime to 2 parts sand was mixed with pebble aggregate to give a rough finish.

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