This is on the Confession, not the Catechisms, but Robert Shaw (1795-1863), Exposition of the Westminster Confession (1845) is not to be missed.

According to the Dictionary of Scottish Church History and Theology, it is the most thorough commentary by a Scottish Presbyterian. (page 770).

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Richard T. Zuelch, M.Div
Ruling Elder, OPC (not currently serving)
Westminster Presbyterian Church, CA (OPC)
www.alexandermaclaren.wordpress.com
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Devout souls do not take offence at the depths and difficulties of God's Word, but are, thereby, drawn to intenser contemplation of them. - Alexander Maclaren (1826-1910)