Maybe not be a Speed but at one time Ellwood Epps in then Clinton Ontario converted some Lees to a one piece stock. You can see a pic. of one on page 73 of F. de Haas book "Bolt Action Rifles".

I purchased one of the above stocks from Epps many years ago and still have it in my parts bin, I suppose I could take a pic. / two, if there is any interest. --- John Can.