I've DMs from moaning Minnies asking where exactly they're supposed to get a jig from? I'll say to you what I said to them: "In the field and under attack from Soviet storm-troopers, who you gonna call... Ghostbusters?".
But having got bored glueing one angle at a time in the cold I've retreated to the conservatory (so yes it was Colonel Colin, in the Conservatory, with a Silicone Gun) where I've used weights ~ sandbags, soldier ~ to apply pressure at the lower end of the bridge and clamp at the upper...
...prior to applying a filets of glue over the remaining junctions to secure each part.
I suggest tho' that you do this where there are no pets, or people with lives.
I could use white adhesive to make it clearer, but it's my party and I'll wear what I want.