Terry
Well, you have the right direction but just missed out on a couple of operations
1) Do the triangle from the Front, either at one end or in the middle, I used the middle just for example, Extrude it and then pattern it out for as many as is needed to cover the Block (Elipse already created) at 0.42in spacing.
2) Before doing the "Combine Cut" copy and paste one of your triangular blocks 90 degrees and use the "Press/Pull" to make it long enough to cover the other direction and pattern it to cover the block
3) now all you need to do is use the "Combine Cut" facility, select the main block and then all the triangular ones and you will have your shape
It doesn`t look very pretty doing it that way on an Elipse as you get varying heights along the edges of the Elipse due to the arced shape, you could do some extra work and make the triangular blocks fit in the shape, would look much better IMHO
Anyway, there are lots of ways to get it looking good cosmetically by for example using a scaled down slightly Elipse to cut all the V blocks to the Elipse shape but just inside, many options, all depends on how much work you want to put into it and just
doing it in lines on an Elipse shaped block then it won`t look so good, you could always make it a little smaller and machine an Elipse for it to fit into
Images below and 2 sample files attached just for fun
Regards
Rob