Turtle - I'm a few weeks from 80 and may be one of the Draw -Tites most continuous users in the United States. I have had the 2 man and 4 man tent for 52 years and still use them. Recently picked up a new, unused 3 man which will go to a grandson. I used these tents yearly on canoe trips floating rivers, lakes, etc. They were also used on numerous camping trips in all kinds of terrain, mountains, desserts, sea shores, etc., In torrential rains, below zero blizzards, blistering heat , heavy wet snows, very strong winds.
No, the 2 man is not a backpacking tent per se but for a two man overnight or trail hiking, the load can be split up. For canoe camping, the four man tent with two canoes and four persons is no problem. Its features far out weigh its weight, pun not intended.
The super light aficionados will scoff, but then they lack real experience with the Draw-Tite.. They like their very light metal or fiberglass poles, but they break (I speak from experience) And the new age fabrics deteriorate from UV, and smell, and not breathe, and are a challenge to set up in a wind, and leak with out a fly (generally a real nuisance), and require guy lines which trip one in the night, and often have colors which are an assault on the senses in our natural outdoors. I have had them, used them enough to realize that the Draw-Tite is of superior design and its fabric will stand up to considerable exposure to the elements. The only thing that one must do is thoroughly dry them before packing them away. Their aluminum poles were made by Alcoa from a special alloy,
and they do not break. The tents that went to the Himalayas were designs from the original Draw-Tite , but had extra reinforcements and other fabrics.
On to your inquiry for repairs and replacement of what you call canvas. While Eureka was making the Draw-Tite, they used a special combed poplin made from cotton with a high count of threads. According to my Eureka archival brochures, they used a variety of names for the fabric. They also said some were 6.5 ounces per square yard and some said 7 ounces.. I have been in contact with the factory about fabric availability. This is what they told me. The cotton fabric they used was from mills in the United States which no longer operate. Whether someone has horded some bolts is any one's guess.
I learned not to loan my tents to just anyone. Last year my 4 man came back with a broken (metal) zipper and torn netting. The complete replacement of zippers and netting is a major job. I found a Montana tent maker than did the complete replacement. Cost? $230. Hate to tell friends they have to put a deposit on my tent before borrowing it. To replicate your 2 man today (factoring in inflation) would cost over $1,100. These were premium tents back 50 years ago.
Back to fabric for replacement or repair. In England are mills which still make a fabric called Ventile. It comes in a variety of weights and colors. You need to have a thick wallet to purchase it by the yard. Just click on to find out about Ventile. The Brits still use Ventile for survival suits in water.when their pilots dtich.
If I were 40 years younger, I would use your tent as a pattern (as suggested by a post above) and get some seamstress to sew it up for you. You can amortize the costs over the next 50 years. Remember, the Draw-Tite was made for canoe camping. None better!
The word "old" seems to have a pejorative connotation today I haven't seen any improvement yet for a tent used by canoeists. As an aside, all these young heroes who play with their "smart phones" will likely have carpal thumb surgery before they die.
John