Trellis, as in mostly 2 dimensional? Not an arbor? For espalier vs. having a roof of Lamarque overhead? Here's {{gwi:299658}} If I were doing it again, I'd leave out the top element as totally unnecessary and top-heavy.

The supports are 4 x 4, the smallest trelliage is 1 x 1. One year soon I expect it to be toppled in a storm, but it's the largest that space accommodates.

Here's a {{gwi:299659}} It is a combination affair, mostly trellis because the rose that grows there now is espaliered. You can't see that on the right, the whole thing is bolted to the house to provide lateral support.

We have a very stout arbor with 8 x 8 posts as supports. The first horizontal elements bolted at the top are 10 x 2. The next element at right angles on top of the 10 x 2 is 4 x 4. It's like the link below but without the additional very top element of 2 x 4. We found the top set unnecessary on the freestanding arbor. If you use very stout 8 x 8 posts, then the upper elements likewise have to be very stout themselves to look right. Here's {{gwi:299660}} The structure is not graceful. Definitely sketch out the whole thing on paper to see the relative proporations. The other thing is to consider how you will provide lateral support. An arbor has those 4 nice posts to keep things from tipping over. Of course grace matters almost not at all once it's covered with Lamarque. The structure pictured in the concept is atop concrete block posts, with 4 x 4's bolted into the posts on each side. That thing isn't going anywhere. You can cut the ends of the rafters to match the architecture of your house.

What wonderful photos, and thanks for the detail! I had Reve d'Or on an arch and loved the way it hung down. For Lamarque at the arboretum we are planning a trellis, as the rose will screen off a jarringly modern glass-in porch on our (reputedly) 1730 farmhouse. Lamarque will provide a backdrop for a row of teas--Lady H., Duchesse, Mr. Tillier. The bed is well out from the house, to allow for room to walk in front of and behind the new trellis for maintenance. Wish I weren't such a techno-dunce I'd send a photo of porch! Seeing your photos really helps-- Thanks.

Lamarque has very sharp, large prickles. Tying it in is going to cause a lot of blood loss. I think it would be better for an arbor than espaliering on a trellis, but if you wear sufficient body (and finger) armor you should be ok.

That said, it's a gorgeous rose. Here it is in the Sacramento cemetery - we have it wrapped around a ten foot tripod, and believe me, I know from painful experience how hard it is to keep it under control!
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Anita