Even with Dr Simoes contributing to the theoretical side, and the greatest hyperphysics establishments in human space (Manticore & Beowulf) assisting, you are probably looking at minimum two years to a functioning GA streak dispatch boat, three years to a warship. In the meantime, that project will be as black as anything ever worked on in Gram or Ghost Rider. After all, they might improve it, or spin off something entirely new.

No one who doesn't have help from MAlign or the yet to be formed GA-Simoes project is going to be developing this from the mere suspicious rumors out of Manticore. Recall that the human applied hyperphysics community HAS been working on breaking the Theta wall...for 4+ centuries without success.
Simoes can't help with the spider, beyond the most vague concepts. David has told us that MAlign compartmentization was tight enough to assure that he has virtually no useful knowledge of it. So the GA is starting from mere scientific suspicions on that one, without even the benefit of general scientific establishment preliminary work on the concept. It is entirely likely that they may not even hit on the right concept for that drive in three years, unless they get some more hard evidence/data. And this whole project will be deep black as well.
I deeply doubt, from what David has told us in Pearls and text and forum, if there is any scientific community in human space, outside the MAlign and Manticore/Beowulf-led GA, that has a prayer of parallel developing the spider. Among the first obstacles, no one except small circles in those polities is even aware of the rumors of it, much less believe it exists. It is re-discovering it, in truth, also, because you can't 'reverse engineer' something that you only have an inferred notion must exist - it would be like a deaf man 'reverse engineering' a saxophone from a single sign-language descussion of the music it makes.
I don't actually think that the GA will come up with exactly the spider, until they have some captured tech, at least bits and pieces of it. I think the focused effort on the mystery might result in some other new twists to drive and hyperphysics, however. Maybe with practical applications in 3-5+ years even.
Let's recall that Gram/Ghost Rider took, what, forty years?
dreamrider