Ah this bugged me for ages when I built my first one. Have you welded the double SB1's to BR12 and SB2 yet or just tacked them? The trick to getting SB1 SB2 and all the top rails in place is to start at the front.
1. Tack the front frame in place making sure it leans back the required 75mm and is square with the base rails. Then tack 2 braces from BR8+9 in place to keep it there.
2. Tack SB1's to SB2 and D7+8 not forgetting they need an extra angle cutting on the 40' end!
3. Add U3-8 and all the Top Rails.
4. Now this is where making sure your build table is square and leveled up using a spirt level across it's width and length will make life alot easier in the next part. Run a tape across from the rear corner of SB2 to the opposite front corner of the front frame, then repeat. When these two measurements are within 1-3mm pat your self on the back as you've done very well indeed!
The spirt level will help you get SB1and SB2 square to the base rails or square left to right, if in dought get a step ladder to look at it from the top to give you an idea of where your going wrong.
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