Neos: Multi Column Content Element (not functional with 2 column)

NodeTypes.yaml

'Daniel.MultiColumn:TwoCol':
  superTypes:
    - 'TYPO3.Neos:Content'
  ui:
    label: 'Two-Column (50/50)'
    group: structure
    icon: 'icon-edit'
    inlineEditable: TRUE
  childNodes:
    content:
      type: 'TYPO3.Neos:ContentCollection'
    content2:
      type: 'TYPO3.Neos:ContentCollection'

Root.ts2

prototype(Daniel.MultiColumn:TwoCol) < prototype(TYPO3.Neos:Content)
prototype(Daniel.MultiColumn:TwoCol) {
	templatePath = 'resource://Daniel.MultiColumn/Private/Templates/TypoScriptObjects/twocol.html'
	contentContainerLeft = TYPO3.Neos:ContentCollection
	contentContainerLeft {
		nodePath = 'content'
	}
	contentContainerRight = TYPO3.Neos:ContentCollection
	contentContainerRight {
		nodePath = 'content2'
	}
}

twocol.html

{namespace ts=TYPO3\TypoScript\ViewHelpers}
{namespace neos=TYPO3\Neos\ViewHelpers}
<div class="col1"><ts:render path="contentContainerLeft" /></div>
<div class="col2"><ts:render path="contentContainerRight" /></div>