Hi Kevin, If you going to make some from cardboard tube the cardboard part 17 1/4" long by 3 11/16" wide. The cardboard is 3/16" thick.
This was measured from an australia 3" mortar tube dated 1943. 
kevin.
p.s. if you now any one who has got a 3" mortar base plate for sale let me know.
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2pdr Tank Hunter Universal Carrier 1942 registered 11/11/2008.
3" Mortar Universal Carrier 1943 registered 06/06/2009.
1941 Standard Mk1 stowage Carrier, Caunter camo.
1941 Standard Mk1 stowage Carrier, light stone.
10 cwt wartime mortar trailer.
1943 Mk2 Daimler Dingo.
1943 Willys MB.
1936 Vickers MG carrier No1 Mk1 CMM 985.
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