Great pictures Funk51.
One of my all time favorite exercises is the bent arm pullover, prefer an Olympic bar but have gotten good results with DB's also. Straight arm pullovers (Olympic, single DB or EZ bar) are also an excellent movement, but not going to handle near the weight, nor the full stretch, than with the bent arm version.
Bent arm pullovers (BB or DB)combined with presses off the chest, the pullover & press, is a prime mass builder. Hitting all the major muscle groups, including the abs, of the upper body. Want a wider lat spread, than might suggest the pullover, just about any version.
If below the 24 to 25 age (mean average) limit, than the cartilage between the ribs themselves are still in a plastic stage, where they can be stretched out a bit before advancing age has them more fixed. Old timers knew the value of the pullover (any version) and the affect it had on chest growth. A 46" chest can look good, but adding a couple more inches through rib box expansion , gives a even more impressive look at 48" is even better. The Half Moon/Moon bench has been ideal for that.
Good Luck