BuddyPress.org

Not sure the extent of the customisations that you want to do but you could try this approach:

Using:
<?php if(bp_is_groups_component() && ‘my-group-name’ == bp_current_item()): ?>

to wrap sections of the single groups views e.g I’ve used this to wrap the group-header.php #item-header-avatar and #item-header-content to allow for custom markup followed by an :else to render the normal markup. You could use this principle on various sections of a group view?

N.B. If copying code directly check the quote marks are correct and not copied as back ticks.