This idea (replicate old structure in a new material) is not really a thing in building conservation. One reason for this is that the dimensions of structural elements are a function of the properties of the original material: it just doesn't make sense to replace a timber beam with a steel one of the same dimensions.
The presence of timber in a historic structure obviously makes it less durable and fire-resistant, but it is authentic, and that is something that is taken very seriously.
It's like an old recipe, an old painting, or an old piece of music. Nobody who is seriously engaged with those things believes in improving them by substituting modern high-tech elements in the course of recreating/restoring an original.
The presence of timber in a historic structure obviously makes it less durable and fire-resistant, but it is authentic, and that is something that is taken very seriously.
It's like an old recipe, an old painting, or an old piece of music. Nobody who is seriously engaged with those things believes in improving them by substituting modern high-tech elements in the course of recreating/restoring an original.