The OP is asking Forum members to offer opinions based on nothing concrete. We need pictures of his/her concern, before anything meaningful can be shared. That said...
The answer to the question asked is huge and requires considerable understanding, far more that can be offered here(hence the suggestion to look through the feature article I suggested in a previous post). Also and, so far, the general theme of offered advice is don't do it, partial or otherwise.
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"98% of the bikes I buy are projects".