Just a build that takes normal Reinhardt gameplay and buffs it. If you don't have the money to afford the epic power for each round I recommend Aftermarket Firing Pin and/or Custom Stock. If you do not have the necessary money to afford them then just go with the common counterparts.
Item purchase order
Round 1
+50% [Charge] Knockback Power. During [Charge], automatically deploy [Barrier Field].
1,000 
1,000 
Enemies below 30% Life are Revealed to you.
1,500 Round 2
1,000 1,000 Enemies below 30% Life are Revealed to you.
1,500 
You can now fly during [Charge].
10,000 Round 3
When you deal damage with [Rocket Hammer], gain 1% Move Speed and 3% Weapon Lifesteal for 2s, stacking up to 10 times.
[Melee] Damage grants 10% Move Speed and restores 5% of Max Life over 2s.
10,000 Round 4
Gain 3% Attack Speed every 100 missing Life, up to 30%.
11,000 Round 5
While [Barrier Field] is active, allies within 5m are healed equal to 5% of your Max Life every 1s.
While [Barrier Field] is deployed, you gain 30% Move Speed.
11,000 Round 6
4,000 Round 7
Every second [Fire Strike] leaves a trail of lava that Burns enemies for 50% of [Fire Strike] damage.
When you deal damage with [Rocket Hammer], reduce the cooldown of your abilities by 1s.
10,000 
