How big does this wooden cross need to be to make the indulgence effective? Six feet or six inches? Does composition matter? Is pine OK?
Here are the conditions from the Pieta Book about this (this is from the Green Book, page 51, which is a large print edition:
1. This devout exercise must be performed before stations of the cross that have been lawfully erected.
2. Fourteen crosses are required in order to erect the Stations of the Cross. As an aid to devotion, these crosses are customarily attached to fourteen tableaux or images representing the Jersalem stations.
From the webpage http://www.shrinesf.org/stations.htm
A plenary indulgence is granted for the Exercise of the Way of the Cross, provided that certain conditions are met: the stations must have been legitimately erected; fourteen crosses of real wood are required (pictures are optional); and movement must be made from one station to the next. Finally, although specific prayers and readings may be used, they are optional; all that is required is a pious meditation on the Passion and Death of the Lord, which need not be a particular consideration of the individual mysteries of the stations (Enchiridion of Indulgences).
No problem with pine, no problem with crosses that might be a 1/4 of an inch in each direction -- but people should be able to see the crosses as they make the stations of the cross.
Maybe someone can ask a Franciscan about this.
The ones in my diocese don't seem to care, which is truly sad.