Coming back to Chappyman66's comment about the Lotus 30, the Lotus 40 did run one Can-Am race; St. Jovite in 1971. Here's a pic of the 40:

I can't find that the Lotus 30 ever did run in the Can-Am from '66-'74, but it did run Riverside and Laguna Seca in '65. To me, the body of the 40 looks like the 30; if you want to run a model of the Lotus 30, then just submit it as a Lotus 40 and you'll be fine. Here's the 30:

Others may differ, but I think that the body similarity between the two cars is very high and I have no objections to it being included. Who know, perhaps a 30 did run Can-Am; I don't have time to go through all of the starting grids and entrant registrations from '66-'74. From my standpoint, it's legal for this series.
Allan